https://coulson.co/architecture daily 1.0 2017-08-29 https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1426212177081-1I76ZT13NPMAO4QPW8PI/MHhouse_CarlyCoulsonArchitect_Rendering_4.jpg ARCHITECTURE - MH House MH House interior rendering in autumn, view of Lake Superior and Duluth Harbor from the third floor living space. Copyright COULSON https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1495132364883-ISJK0H5I4TM5CBI61ZAN/Disappear_Retreat_Image01_copyright_COULSON.jpg ARCHITECTURE Disappear Retreat dissolves the ecological footprint and provides seamless living with nature. Imagine it is -25˚F on a typical winter morning in northern Minnesota, yet no heating is required. Reducing the heating load by 95% using passive methods is a critical strategy to achieve zero-energy. A minimalist palette and layout keeps the focus on the beautiful surroundings, offering a meditative experience. This model has a built-in bed/sofa with storage, toilet, sink, shower, and refrigerator drawer. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1426214128482-5703XOURC26V7HF5KFRK/BagleyClassroom_CarlyCoulsonArchitect_PaulCrosbyPhotographer_19.jpg ARCHITECTURE - Bagley Classroom Exterior photo of the Bagley Classroom at the University of Minnesota Duluth. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1426212734991-6GT99EYBZSGWOBYBPB58/PaysDenHaut_CarlyCoulsonArchitect_BruceDamontePhotographer13.jpg ARCHITECTURE - Pays d'en Haut Exterior Photograph of Pays d'en Haut. Carly Coulson, Architect. Bruce Damonte, Photographer. https://coulson.co/coulson-cv daily 0.75 2018-01-24 https://coulson.co/about daily 0.75 2018-01-24 https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1502947570952-C9YWI5OBNVKLY13GDNT3/Architect+Carly+Coulson%2C+AIA%2C+LEED+AP ABOUT AWARDS https://coulson.co/projects daily 0.75 2025-07-08 https://coulson.co/news daily 0.75 2018-04-10 https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1508618157129-DO0G1NDUOFXV68M84CMP/GreenGoodDesign_Pays_den_Haut_COULSON_1.jpg NEWS https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1508615212792-6M7VEOKR6Z0I1RYVCXLA/aia2030_2017_v4.jpg NEWS https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1518036090482-XWXR6B97MMQ9SNA7J8HB/Pays_Den_Haut_Carly_Coulson_Architect_Bruce_Damonte_Photographer_05.jpg NEWS https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1430456609965-MOX2W95SZ8IUBN2NHKLN/Carly+Coulson+Architect_Milan+Expo+2015 NEWS https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1523393724411-FAAGEQYYLAPF180DN36I/ARCHITECT_Magazine_February_2018_COULSON_Invisible_Sustainability.jpg NEWS https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1503960051224-OFH4GUJU4THN51RPHMO7/Disappear_Retreat_Image09_copyright_COULSON.jpg NEWS https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1504013327593-AA4ZNHHSLFKNMY3OYLUB/Architect_Carly_Coulson_with_Sydney_Glass_Canopy_model.jpg NEWS https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1513395763829-X7H7UJSP1EICYCW2S0AA/Disappear_Retreat_Image01_copyright_COULSON.jpg NEWS https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1430460342886-ZRIV0WYM9Q038RCTT96J/Pays+d%27en+Haut_Carly+Coulson+Architect_Bruce+Damonte+Photographer_Kitchen+Entry NEWS https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1518112826592-688311SWT649XSNH6KV3/LakeShoreNews_Carly_Coulson_MH_House.jpg NEWS https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1518041541877-L0YQVWXWYD80TUY8U9OL/Bagley_Classroom_Carly_Coulson_Architect_Paul_Crosby_Photographer_9.jpg NEWS https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1508612371109-49PR4LRT2T3IZD0XRXCB/Disappear_Retreat_copyright_COULSON_DesignDETAILmagazine_Oct1017_4.jpg NEWS https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1430460646981-CSHI8TMAVERIK269BWA1/MH+House_Carly+Coulson+Architect_Rendering+Third+Floor+Interior NEWS https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1513396637355-CGWYX75I2NH48DWFBLME/Disappear_Retreat_Winter_Birch_Forest.jpg NEWS https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1516804421467-WFNQQBYOFCASB0D9FF22/StarTribune_Carly_Coulson_She_Makes_Green_Transparent.jpg NEWS https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1513395445599-DTJD6E2G0Q5EDG4MN0QK/invisible_sustainability_.jpg NEWS https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1509225366402-T5BRJSNFVL1C96JR0IE3/ARCHITECT_Magazine_Climate_Is_Changing_double_vertical.jpg NEWS https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1508620788561-W0RGER6WU1AWGJXU9FYZ/GreenGoodDesign_MH_House_COULSON_1.jpg NEWS https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1523396832133-ABRLCX8X1EM1DEPQP38L/Disappear_Retreat_copyright_COULSON_March2018_news.jpg NEWS https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1430456486679-OEHNEDYV2PCPHQYPTSMD/MH+House_Carly+Coulson+Architect_Exterior+Rendering+Winter NEWS https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1518032467788-7OJYPK3AA03AHMGBB6QV/TreeHugger_COULSON_In_Praise_Of_Invisible_Sustainability.jpg NEWS https://coulson.co/disappear-retreat-preorder daily 0.75 2018-03-06 https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1497136857556-96SITBLEHHP2EZ7HICC4/Disappear_Retreat_Image01_copyright_COULSON.jpg Disappear Retreat Pre-Order https://coulson.co/mh-house daily 0.75 2018-04-09 https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1496094367978-LL9STGR161KA26JDOL14/image-asset.jpeg MH HOUSE A tight row of columnar cedars break the northern winds, mask the neighboring buildings, and form a contemplative outdoor room along the copper screen wall. The morning light highlights the rich copper patina as one enjoys an intimate view of sunrise over the Great Lake. In the warm months, the cedar aroma and fresh coolness from this shaded space drifts into the building through the copper screen, with the interior solid wall panels removed, transforming the stairwell into a three-story screen porch, a wonderful place to lounge, rest and read. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1496095949201-79QW22CMLYWWJLBXVO24/image-asset.jpeg MH HOUSE The design achieves a 90% reduction in primary energy demand (without any on-site or off-site renewable energy systems) using passive and low-tech solutions: extremely compact exterior form, passive solar heating, summer shading, super-insulation, air-tight and thermal bridge-free construction, and energy efficient heat recovery ventilation. In an extremely cold climate where January low temperatures are often –30˚F, the peak heating load for the entire project is only 2000 watts (one hair dryer). An 800 watt electric radiant panel with a mirror cover in each bathroom provides the heat. There is no need for an active cooling system as a tiny 1 gallon geothermal heat exchanger integrated within the ERV will cool and dehumidify the incoming fresh air in the summer (and preheat in winter). The projected energy savings will last the lifetime of the building as the primary focus is on permanent, passive solutions. Additional energy savings are achieved with Energy Star rated appliances, LED artificial lighting, and abundant daylighting. Potable water consumption is reduced by 48% with high-efficiency dual-flush toilets, low-flow showerheads and faucets, and a drought tolerant green roof and landscaping. All stormwater is held and filtered on-site with vegetated roofs, permeable paving, a french drain system, and rain garden zones. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1496095784577-Q78KOP2EIVAC9G5GE7MH/image-asset.jpeg MH HOUSE From the alleyway to the north one crosses the threshold of a stone landscape wall and down a narrow lane through a dense grove of tamarack trees that transform from vibrant gold in autumn to ghostly silhouettes in winter. Lake Superior comes into view. A paved stone plinth appears to flow inside the buildings, blurring the line between interior and exterior, and grounding the structures into the landscape. A field of tall reedgrass gently shifts in the wind adding a layer of privacy and a sense of enclosure around the courtyard where one can enjoy a quiet lunch or a summer office party and visitors can park. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1496094583252-0Y89PGAUCIZFPV9DTTGX/image-asset.jpeg MH HOUSE Climbing the minimal steel and limestone stair through this tall narrow void between the copper screen and the wardrobe wall, one occupies an unfamiliar fissure, an in-between space. This layered collage of materials and structure changes character if the wardrobe doors are open, revealing the texture of books and objects, or the doors are closed concealing all behind a pure monolithic wood wall. Passing through this wardrobe wall (like in the client’s favorite childhood book by C.S. Lewis) one crosses with youthful exploration from this introverted refuge space to the open and sunlit live-work world on the other side. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1496094735204-QW55ZNEZRWLKT07QZQ7V/image-asset.jpeg MH HOUSE All of these components and functions are precisely interlaced into a three-dimensional, functional weave: views, vegetation, sun, stone, steel, copper, glass, trees, and timber. This material palette and complex layering inspired by the North Shore wilderness is assembled with a modernist order, efficiency and clean line, while embracing metamorphosis in patina and vegetation. Soft natural light touches all the rooms, even with drapery drawn, through roof light tubes concealed by an etched glass ceiling. Like the tranquility of a translucent ice covered lake, the etched glass floors/ceilings have an immaterial lightness. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1496117800583-DQ7GB1VOIT7VHTIKXRGD/image-asset.jpeg MH HOUSE The simple architectural form and site placement is based on function, efficiency, views, and the sun. The new one-story and three-story buildings, arranged perpendicular and offset vertically, create an oasis of in-between courtyard spaces and a strong sense of place. This positioning allows every floor a generous lake view and the ideal exposure for passive heating. Continuous floor to ceiling glass captures the winter sun and frames the expansive vistas of Lake Superior to the southeast, the Duluth Harbor to the south, and Observation Hill to the southwest. The only solid walls face the northwest and northeast where there is no desirable view. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1496094685532-80JZ6C8C64APK3R5VDJJ/image-asset.jpeg MH HOUSE Living and working in this glass vessel one experiences, in full-body feeling, the outdoor world: the vibrant city, the ever-changing landscape, seascape, weather, and seasons. This open exposure is balanced by strong timber beams and the wood wardrobe wall which acts as a backstop to keep one grounded and feeling warm and sheltered. Bluestone interior panels on a continuous track, pivot and slide to enclose the bathroom and stairway and additional panels can display art or office work. Continuous pleated drapery can transform the open vessel into a private oasis and the exterior façade into a simple, opaque glass and metal grid. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1496095878096-XLHRFWJIXGCAYE45ZNHU/image-asset.jpeg MH HOUSE “How much does your building weigh?” -R. Buckminster Fuller   MH House offers an innovative and integrated design response that strives for significant lightness in energy, resources, cost, flexibility, and feeling. Using invisible elements, like passive solar heating and air-tight enclosure, the project’s heating load is cut by 95%. The traditional heating and cooling systems are eliminated which reduces space requirements, maintenance, and floor thickness. Very thin floors along with ultra-thin vacuum insulated wall and roof panels and high-performance glazing, create a diminutive, jewel-like building with minimal exterior surface area and maximum transparency. MH House is designed for Passive House Certification through the Passive House Institute (PHI) and LEED Platinum Certification. The project demonstrates that transparency and lightness can be part of the design vocabulary that meets these rigorous standards.   https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1496094779472-T9NAVWI3CQ3V1E1GC7KQ/image-asset.jpeg MH HOUSE MH House re-imagines a new, highly flexible, office and residential building type that embraces the mixed-use, urban location and anticipates the future needs of the client and the community. Each floor has a bathroom and kitchenette and can function as four individual studio apartments, as a 3 story single-family home with a separate 1 story office/apartment/guest suite, as an office on the ground floor and living above, and several other variations. For the client, single with a small design business, the layout offers a future resiliency for the expansion or contraction of the office, an elderly parent moving in, or the option for rental income. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1496092187605-WJ4D9XVE589AJQ65PGL2/image-asset.jpeg MH HOUSE MH House “Wilderness is a spiritual necessity, an antidote to the high pressure of modern life, a means of regaining serenity and equilibrium.” -Sigurd Olson It inspires a childlike curiosity for exploration and a sense of being outside of time. It is rare for one to experience this evocative complexity or sense of wonder in our everyday built environment. MH House is located in the dense urban fabric of Duluth, Minnesota but strives for a transformative sense of place that weaves the client’s love for the beautiful North Shore landscape into a suite of compact, near-zero energy, modern glass pavilions for residential and office use. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1496095846899-9FLN19BZ4BUZWJOI5B8V/image-asset.jpeg MH HOUSE The summer is cool and verdant behind a veil of iron scaffold and a weave of vegetation. A precise eight by eight framework gives order to the design, adds a layer of depth to the façade, and supports a thin extension of grating that wraps the upper floors and roof to block the midday summer sun. Hops vines drape the structure imparting a lush green texture on the interior and exterior. The winter mood, with edible vines harvested, is stark and rhythmic. A carpet of sedums adds an organic softness to the thin roofline. White birches enclose the courtyard with graceful trunks and delicate leaves scatter the afternoon sun. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1496094314969-S2B6XF9MGSF61Q3I9KCO/image-asset.jpeg MH HOUSE One elegant muse is the Old Duluth Public Library. It has a rigorous sense of order, a polite compact form, a copper dome with a verde patina, and a proud craftsmanship that exudes a patient, timeless feeling. MH House has an affinity for these classical qualities of clear rationale, precision, honest materials, and a respectful scale. The proposed design establishes human proportions and a reserved stature using an eight foot horizontal and vertical grid. This refined geometry of exposed structure sets up the rhythm of the building and every element is tied to it and every detail contributes to its clear concept. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1496118562652-OKD2WMIL74Q203RAY14Y/MH_House_context_plan_copyright_COULSON.jpg MH HOUSE The site is a previously developed vacant lot in the Creative Corridor of historic downtown Duluth. It is surrounded by galleries, restaurants, theaters, cafes, a local co-op grocery, and mixed-income housing in the early stages of revitalization. The atmosphere of the neighborhood is defined by Lake Superior, an overwhelming element of transfixing, ever-changing beauty, accompanied by the salutes of the ships entering harbor, the chimes of the old clock tower, and the fog horn cries through the night, all magnified and echoed by the steep hillside buildings of weathered copper and masonry. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1496096348155-XZVDHD3RXKNJK0DHP3BY/image-asset.jpeg MH HOUSE - Etched glass block floor/ceiling set in clear anodized aluminum frame. - Lacquered black glass countertop and cabinet fronts at kitchenette. - 99% efficient tankless, electric hot water heater in each bathroom. - 800 watt electric radiator panel with mirror cover in each bathroom. - 84% efficient PH certified ERV including pre-heating/pre-cooling of outside air with integrated geothermal heat exchanger connected to 4 helical vertical ground loops 15 feet deep. - Natural ventilation in the summer provided when VIP wall panels are removed, utilizing the copper screen to transform the stairway/entryway into a large screen porch. - Pre-grown, low-profile, vegetated roof trays. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1496095992767-GNAY15XWKYB4VWIZBKF5/image-asset.jpeg MH HOUSE The construction approach is a prefabricated kit-of-parts. The design is planned on a rigorous grid, where the exposed construction is a central part of the aesthetic.   - EPS insulation raft surrounding a concrete slab. - Exposed steel columns and beams. - Triple-pane IGU structural silicone glazing. - VIP (vacuum insulated panel) wall and roof deck. - Triple-pane, tubular skylights with XPS curb. - Local limestone pavers, floor tile, and stair treads. - Recycled porcelain aggregate. - Recycled industrial copper screen panels. - Local Isabella blue stone at sliding-pivoting panels. - Local, recycled, white terrazzo at bathroom floors/walls. - Reclaimed doug fir beams and storage wall cabinetry. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1523304494421-FO50RK0QWLWZXQCDTU0E/Carly_Coulson_MH_House.jpg MH HOUSE Metrics: 2430 total sq. feet 25 kBtu(sqft.yr) 80 kWh(sqm.yr) pEUI 0.6 kBtu(sqft.yr) 2 kWh(sqm.yr) space heat demand 0.40 ACH50 pressurization test R-59 0.096 W(sqm.k) solid wall and roof R-103 0.055 W(sqm.k) slab foundation R-10 0.568 W(sqm.k) glass and frame R-11 0.516 W(sqm.k) skylight 85 / 51 walk / transit score   Certifications (pursuing): Passive House (PHI-Germany) LEED Platinum 2030   Awards: Chicago Athenaeum Green Good Design 2016 RADA Residential Architect Design Award 2015 THE PLAN Award Shortlist 2015 WAN Award Future Projects Shortlist 2015   Publications/Exhibits/Presentations: ARCHITECT Magazine - Feb 2018 AIA Architect - Dec 2017 Green GOOD DESIGN Yearbook 2016-2017 Design A Better World Now Exhibit - Athens 2016 THE PLAN Award Exhibit - Milan 2015 THE PLAN Forum Lecture - Milan 2015 Residential Architect Magazine - Vol.2 2015   Information/Contact: info@coulson.co instagram @coulson_architect download project pdf   © 2015 COULSON https://coulson.co/disappear-retreat daily 0.75 2018-04-09 https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1495143676020-54T4Q44E8CBUUH4HL1Z7/image-asset.jpeg DISAPPEAR RETREAT Scattered amongst the boreal forest near Grand Marais, Minnesota like a family of spotted mushrooms, the first prototype buildings will form a Retreat Center offering a non-profit residency program to artistic and scientific professionals, public outreach on sustainable building and climate change, and overnight stays for those interested in test-driving the design. Visitors will become attune to resource use and the naturally integrated sustenance from the earth and sun and gain creative rejuvenation and inspiration from the landscape. Prototype construction is underway, Spring 2018, and will undergo rigorous testing and evaluation at this site before launching into production and available to the public for purchase in 2019. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1495143788278-2OJ38R416P9WDQW2C5PM/image-asset.jpeg DISAPPEAR RETREAT The design strategies that reduce the energy demand by 86% are woven into the architectural solution and extensively tested with advanced energy modeling. Disappear Retreat meets comfort and performance targets for Passive House and Zero-Energy in cold climate locations like Minneapolis, Duluth, Portland, Vancouver, Seattle, Toronto, Edmonton, Montreal, and Calgary. With minor adjustments to the glass solar heat gain Denver, Provo, Chicago, Madison, Buffalo, and New Haven also perform well. All Disappear Retreat locations will have a custom site and climate evaluation. An ideal site is at the edge of a tree clearing to maximize solar energy, maximize winter passive solar, and minimize summer heat gain with leafed-out deciduous trees. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1495141662374-36ULJ55HC7KFPW37L6DF/image-asset.jpeg DISAPPEAR RETREAT What does triple-zero living look like? How far can we drive a conservation-first approach so systems are tiny and integrated? Can we achieve lightness and transparency in extreme cold climates? Can we eliminate the heating and cooling systems using passive design? Can we create a minimal architecture, yet still achieve super-insulation and thermal bridge-free details? How far can we advance a certified Passive House and Living Building to prioritize architectural experience and aesthetics? How small can it be, designing a minimalist lifestyle that is functional with less stuff and more freedom? Can it be affordable, transportable, and adaptable? Can design excite the public about sustainable building showing it is simple, sexy, and feasible? These are questions that began the process. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1495142461025-4CNGTTI3A6EKJ7VSRZUT/image-asset.jpeg DISAPPEAR RETREAT Imagine it is -25°F on a winter morning, yet no heating is required. Disappear Retreat integrates the components for triple-zero performance into an almost invisible, ethereal state. The design is light, transparent, and seamlessly connected to the surroundings, dissolving into the landscape where the building form is compact and the glass takes on the identity of the site in its reflections (transparent ultraviolet color prevents animal collision). A spotted pattern of thin-film PV in the south glass wall generates all the energy needs from the sun and camouflages the building amongst the trees like a quiet forest animal. Weathered wood softens the design and blends with the landscape. As evening approaches the clear glass roof emits a warm, welcoming glow. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1495143829761-NFXFL2RXMS635SY5QHRI/image-asset.jpeg DISAPPEAR RETREAT The design takes a conservation-first, keep-it-simple approach with passive solutions that drastically cut energy use. The 8x10x9ft structure is incredibly compact, reducing exterior surface area and, therefore, unwanted heat loss or gain. The air-tight and super-insulated enclosure will never drop below 60°F inside no matter how cold outside and without any sun exposure, so plumbing systems are always safe. Passive solar heating through the glass roof and walls is utilized in the winter, modulated in spring/fall with insulated shades, and blocked in summer by trees and shades. These strategies reduce the peak heating load to just 100 watts (1 light bulb), a 95% reduction. No mechanical heating or cooling is needed. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1495143000448-QGP4ORY40CF8NPF12TWN/image-asset.jpeg DISAPPEAR RETREAT The project is designed for and inspired by creative work. Art, literature, music, and poetry influence the sense of place we are striving to achieve. Exploring surreal, transcendental, nouveau, abstract, bauhaus, minimalist, classical, and experimental universes. The dwelling provides an immersion in nature to recharge the mind and creativity, allowing occupants to disappear into their work and the landscape. “I seek the power of the rock, the magic of the water, the religion of the tree, the color of the wind, and the enigma of the horizon.” -George Morrison https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1495143600298-EJJPNB6GYV53ITHPSB9I/image-asset.jpeg DISAPPEAR RETREAT From the exterior the design disappears in the landscape like a chameleon. Photovoltaic spots and reflective glass merge with the surroundings for a quiet and surreal sense of place. Alone in the landscape, all the rules dissolve. One’s sense of time, order, and sequence are transformed. “Why sometimes I’ve believed as many as six impossible things before breakfast!” -Lewis Carroll, Alice in Wonderland Strangeness is essential to creativity. All the limitations that come from familiarity are gone and everything becomes a possibility. Disappear Retreat explores these new possibilities. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1495143476854-HM93LXZXB94ZJD9H98HL/image-asset.jpeg DISAPPEAR RETREAT “You lose consciousness of your own separate existence. You bend with the landscape, and become part and parcel with nature.” -John Muir Melting into the landscape with every breath, the Basic model open plan provides a contemplative, adaptable space for exercise, meditation, and yoga. Healthy indoor air quality is achieved with a pair of thru-wall ERV (energy recovery ventilator) discreetly positioned above the north door, providing continuous, balanced. and filtered fresh air and exhaust with minimal impact on sound, energy, or heat loss (heat recovery efficiency 90%). The door can be open to expand the interior space and utilize natural ventilation. An integrated retractable insect screen keeps bugs out without effecting the view. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1495144064575-PDMPG6GC977AL11TQ1A3/image-asset.jpeg DISAPPEAR RETREAT Rainwater is collected off the Shed roof, filtered, treated, and stored in tank for potable water use on-site. All blackwater waste is treated in a composting system. A pattern of thin-film PV is integrated into the south facing roof and door panels and supplies power to the waste and water systems, electrical vehicle charging, and excess is stored in batteries for Retreat building emergency backup. Shed uses passive solar heating through the roof eliminating need for mechanical heating and keeping waste and water systems operational in winter. The 5x7x20ft structure stores bikes, kayak, bins, and maintenance tools. It’s also ideal for winter gardening. Like Retreat, the Shed dissolves into the landscape with reflective glass, photovoltaic spots, and grey weathered wood. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1495142834607-90T74NUA9681WW74A0UX/image-asset.jpeg DISAPPEAR RETREAT The spark for the design came under the night sky viewing a psychedelic show of northern lights and imagining a small, self-sufficient retreat with a glass roof where the universe overhead and surrounding ecosystems press close, where one feels connected to the planet and can sleep under the dazzling stars and dream with eyes open. We wanted to share this experience in a design that nurtures creative minds: those who can harness these natural wonders and reveal it to others through their work and words. “Press close bare-bosom’d night – press close magnetic nourishing night! Smile O voluptuous cool-breath’d earth! Smile, for your lover comes.” -Walt Whitman, Song of Myself https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1495143737569-MO9JW23KJX10P4C40TQE/image-asset.jpeg DISAPPEAR RETREAT “Look deep into nature and you will understand everything better.” -Albert Einstein Stargazing under a dazzling night sky we see beyond ourselves light-years into the future. Hiking in the lush tapestry of the forest we understand the fragility of our ecosystems. We know the impact climate change will have on future generations. A paradigm shift is essential. Today we have all the elements needed for simple, affordable, self-sufficient building without sacrificing design freedom. Disappear Retreat merges design and performance. Low-tech components and passive strategies dissolve into the architecture. Smart integration is the innovation. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1495144026426-JB0GZ72QWKKA3IUW880M/image-asset.jpeg DISAPPEAR RETREAT Under the accessible floor of the Retreat Bed+Bath is a potable water tank for sink/shower, a greywater tank for sink/shower wastewater, and a blackwater tank for toilet waste. These systems are similar to an RV and keep energy, complexity, cost, land disturbance, and floor height at its lowest. The Shed provides composting and rainwater treatment for multiple Retreat buildings to achieve a Zero-Water Zero-Waste facility. Filling/emptying of tanks is required every 2 weeks. Tote-along portable tanks with vacuum pump can transfer waste and water, allowing a remote location of Retreat. A portable pump and hose works if Retreat and Shed are within a few hundred feet. At sites with existing septic and well or city services, Bed+Bath can connect to them, but is no longer zero water/waste. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1495143331825-RA9OS8D4303CVEHSJH5J/image-asset.jpeg DISAPPEAR RETREAT Retreat has three models with identical exterior enclosures and alternative interior layouts: The Bed+Bath model has built-in sofa/bed with storage underneath, toilet, sink, shower, refrigerator, and induction cooktop. The Basic model is flexible open plan for art, music, meditation, office, and living space adaptable to future needs. The Sauna model has built-in wood benches and sauna heater. The transportable design fits on a standard trailer, has minimal impact on the land, and is resilient to changes in climate, ownership, function, and economics. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1495143542149-YETKWCXD4EN3WYEBDQQL/image-asset.jpeg DISAPPEAR RETREAT “Simplicity is the ultimate sophistication.” -Leonardo da Vinci Disappear Retreat has a neutral palette of only three finish materials, creating a zen atmosphere that emphasizes the exterior views and increases the perceived sense of space as the materials flow seamlessly from interior to exterior and from floor to wall to roof. 1/4 inch thick insulated fabric shades at the roof and windows modulate heat gain, glare, acoustics, privacy, and mood. These join with a fabric upholstered wall, adding a softness and sense of comfort to the interior. The crisp glass details are balanced with the tactile warmth of the reclaimed grey weathered wood which blends with the surrounding rocks and trees. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1495143063034-6QC7VUR9GX22A6S4IPJE/image-asset.jpeg DISAPPEAR RETREAT The result of these objectives, questions, and influences is a transparent, stargazing, triple-zero building, dissolving the impact on the environment physically and aesthetically. The living essentials are integrated into a prefab, off-grid dwelling providing a minimalist lifestyle in resources, cost, and aesthetics. The high-performance enclosure meets the Passive House Standard and will pursue Living Building Challenge certification, the two most rigorous environmental targets in the world. The 83 sqft building requires no active heating or cooling systems and has a peak heating load of just 100 watts in the extreme cold of northern Minnesota. It performs similarly well in cold climates from Seattle to Buffalo and Chicago to Calgary (with minor adjustments to glass specifications). https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1495143385519-PDFQYWD3PTQLNSVKDUDK/image-asset.jpeg DISAPPEAR RETREAT Disappear Retreat integrates low-tech components widely available today into a factory-assembled enclosure that uses the passive design approach of super-insulation, air tightness, thermal bridge-free details, compact form, winter passive solar, and summer shading to achieve deep energy reductions. R-values range from 32 at the glass walls and roof to 87 at the floor. The materials have very high insulation value with minimum thickness: Triple-pane insulated glass units; Aerogel Thermal Wrap at shades; VIPs (vacuum insulated panels) at floor and walls. Striving for lightness in weight and aesthetics, the minimalist details keep the focus on the beautiful surroundings, offering a meditative experience and the feeling of living outdoors. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1495143925893-2278E9PEQ92WO7BAN01O/image-asset.jpeg DISAPPEAR RETREAT With the heating and cooling loads eliminated, the remaining energy demand for the Bed+Bath model is just 7 kBtu(sqft.yr) (an 86% reduction compared to the Midwest average). This includes tankless electric hot water, refrigerator, ventilation, induction cooktop, LED lighting, water system, and consumer electronics assuming 1 occupant full-time with occasional guests. This tiny energy demand is easily supplied by the off-grid photovoltaic system integrated into the south glass wall, achieving zero-energy with small battery storage. The sun provides all we need. Investing in passive, long lasting, and integrated elements like insulation means the performance will last the lifetime of the building (50+ years). https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1495144119899-O9IAGFJAVRY1N7N7FBQY/image-asset.jpeg DISAPPEAR RETREAT Disappear Retreat brings lightness in mind, resource use, and design with all essentials and systems seamlessly integrated allowing the surrounding beauty to be the focus, living in balance with nature. “I went to the woods because I wished to live deliberately, to front only the essential facts of life, and see if I could not learn what it had to teach…” -Henry David Thoreau   Metrics: 7.3 kBtu(sqft.yr) 23 kWh(sqm.yr) pEUI before PV -8 kBtu(sqft.yr) -25 kWh(sqm.yr) pEUI after PV 4.4 kBtu(sqft.yr) 14 kWh(sqm.yr) space heat demand 0.40 ACH50 pressurization test R-87 0.065 W(sqm.k) floor R-59 0.096 W(sqm.k) solid wall R-32 0.176 W(sqm.k) glass + insulated shade Certifications (pursuing): Passive House (PHI-Germany) Living Building Challenge NZEB 2030   Publications/Exhibits/Presentations: IIT Magazine - Apr 2018 DesignBoom - Mar 2018 UNCRATE - Mar 2018 CURBED - Mar 2018 Outdoor Aesthetics - Mar 2018 HiConsumption - Mar 2018 HAROLD - Mar 2018 PLAIN Magazine - Mar 2018 NEW ATLAS - Mar 2018 THE SPACES - Mar 2018 E-Architect - Mar 2018 INHABITAT - Mar 2018 HYPEBEAST - Mar 2018 ARCHITECT Magazine - Feb 2018 Star Tribune - Jan 2018 AIA Architect - Dec 2017 Design DETAIL Magazine - Sept 2017   Information/Contact: sign-up for updates and pre-order instagram @disappear_retreat instagram @coulson_architect info@coulson.co download project pdf     © 2017 COULSON https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1495139717258-A3CZRSG76DOTVL5ECOHR/Disappear_Retreat_Image01_copyright_COULSON.jpg DISAPPEAR RETREAT Disappear Retreat: dissolving our living footprint to zero energy, zero waste, zero water.   COULSON is dedicated to the highest level of sustainability and design excellence. We push and explore the range of aesthetic creativity while meeting rigorous performance targets. We engage in extensive research and development to advance our groundbreaking ideas. Our passion for the environment is not just technical, but extends to the experience of nature, which is an essential inspiration in our design work and life. We want to insinuate into the landscape and live seamlessly and lightly with its mysterious beauty. This is the starting objective for this project. https://coulson.co/pays-den-haut daily 0.75 2017-10-21 https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1503520139623-2IHR6CHPLW7GR5SBEXKP/Pays_Den_Haut_Carly_Coulson_Architect_Bruce_Damonte_Photographer_07.jpg PAYS DEN HAUT Air-tightness: There is a continuous air sealing system throughout the building. An existing poly film air-tight membrane was maintained on the below-grade walls. New plywood sheathing with seams taped creates a protected air-tight layer above-grade between the existing 2x4 wall and the new larsen truss. A new air-tight membrane was added below the attic and the ceiling was framed down so MEP does not penetrate this membrane. Blower door testing verified the air-tightness during and after construction. Heat Recovery Ventilation: A certified passive house HRV with an 84% heat recovery efficiency was installed in a master bathroom cabinet, providing continuous fresh air and exhaust throughout the home for superb indoor air quality. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1503520024821-LPBA2HNWH6BT9M0E5KGD/Pays_Den_Haut_Carly_Coulson_Architect_Bruce_Damonte_Photographer_06.jpg PAYS DEN HAUT The design meets the requirements of an EnerPHit project (Energy Retrofit with Passive House Components) reviewed by the Passive House Institute (PHI-Germany). It achieves an 82% reduction in energy demand compared to the existing building without any renewable energy systems. The project meets AIA 2030 with a 61% EUI reduction compared to the US Residential Regional Average. Environmental impact was minimized by renovating verses demolition. 95% of the existing structure was kept in place and 80% of the deconstructed materials were reused or recycled with donated materials and fixtures going to Habitat for Humanity. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1503520088763-XC162MJDCPJYUJ6R5QNH/Pays_Den_Haut_Carly_Coulson_Architect_Building_Section_Construction_Details.jpg PAYS DEN HAUT Super Insulation: A 12 inch remote-wall larsen truss filled with cellulose insulation was added to the above-grade exterior walls. This has a low carbon footprint, minimal thermal bridges, utilizes scrap 2x and plywood material and is fast and easy to install. Cellulose insulation was added to the attic and the existing exterior wall cavities. 12 inch EPS foam insulation was added to the below grade-walls. New triple-pane glass and passive house certified window and door frames were installed, eliminating drafts, condensation, and the need for heating near glazing. Existing window and door locations were utilized with the majority of the glazing facing south and southeast for optimal passive solar exposure. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1503520287922-G0EYK22XC2HYM9VK4J5E/Pays_Den_Haut_Carly_Coulson_Architect_Bruce_Damonte_Photographer_09.jpg PAYS DEN HAUT COULSON completed hygrothermal modeling for the diffuse-open wall and roof assembly to evaluate the long-term moisture performance. Given the original exterior finish on the home, a non-vented EIFS stucco system, caused significant moisture damage and was the catalyst for this major renovation, the value of our building analysis and careful detailing was understood and appreciated by the client. The design provides peace of mind, resiliency, and longevity. Without any mechanical or passive heating, the interior will never drop below 60˚F. It can be occupied in a power outage without concern for frozen pipes or temperature discomfort. Natural lighting meets illumination needs in 100% of the habitable spaces. Large operating doors and windows provide natural ventilation and passive cooling throughout. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1503520328818-7UQ86I7DEC2GH6Y01ZDK/Pays_Den_Haut_Carly_Coulson_Architect_Bruce_Damonte_Photographer_10.jpg PAYS DEN HAUT This reverence for nature extends to the conservation of the surrounding land, soil, and habitat. Improving site drainage and protecting the sensitive watershed of streams and rivers that flow into Lake Superior was important. New french drains and permeable slate aggregate surrounding the building filter and hold stormwater. A geo-web system installed under the groundcover of the steep hillside prevents soil erosion. Within the 0.75 acre lot there was no increase in the development footprint. The natural habitat area was enlarged to include extensive planting of native bluestem grasses flowing from the street to the lakeside. New birch and spruce trees were planted and the existing red pine stand to the north was protected. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1503519731187-62YHMESFET4UNHWTHOXO/Pays_Den_Haut_Carly_Coulson_Architect_Bruce_Damonte_Photographer_04.jpg PAYS DEN HAUT The existing building form is unchanged, however, 12 inches of insulation was added above and below grade along and high-performance windows and doors for a super-insulated, air-tight, enclosure that meets the rigorous Passive House requirements. With this investment in the building envelope, the heating load was reduced by 84% and the traditional forced-air heating system and large furnace room next to the stair was eliminated. This allowed a complete transformation of the lower floor into an open, daylight-filled, sculptural space with a fluid connection between floor levels, abundant built-in storage and a new usable room. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1503519195999-EE85JTAHH04MVP1HRSMZ/Pays_Den_Haut_Carly_Coulson_Architect_Bruce_Damonte_Photographer_02.jpg PAYS DEN HAUT This near-zero energy, renovated home designed by COULSON acts as a vessel for those feelings. Boundaries removed, vistas cleanly framed, surrounding development screened, doors opened to new exterior rooms, and a smooth cascading flow between spaces, floors, and terraces. The passage of time, seasons, and weather visible in the light, shadow, and reflections. Nature’s warm hues and delicate patterns referenced in the wood, marble, and metal fixtures. The flow of similar materials and details between exterior and interior encouraging the eye and the spirit to move freely. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1503520520263-8UY5068QR3S42FSNF3CS/Pays_Den_Haut_Carly_Coulson_Architect_Bruce_Damonte_Photographer_13.jpg PAYS DEN HAUT Awards: Chicago Athenaeum Green Good Design Award 2016 THE PLAN Award Shortlist 2015 ASID Minnesota Award 2015   Publications/Exhibits/Presentations: Architect Magazine - Oct 2017 Green GOOD DESIGN Yearbook 2016-2017 Design A Better World Now Exhibit - Athens 2016 THE PLAN Award Exhibit - Milan 2015 THE PLAN Forum Lecture - Milan 2015 International Passive House Database No. 4443 DasHAUS Exhibit - Chicago 2012   Metrics: 2500 total sq. feet 25 kBtu(sqft.yr) 80 kWh(sqm.yr) pEUI after 133 kBtu(sqft.yr) 419 kWh(sqm.yr) pEUI before 6 kBtu(sqft.yr) 22 kWh(sqm.yr) space heat demand after 37 kBtu(sqft.yr) 116 kWh(sqm.yr) space heat demand before 0.62 ACH50 pressurization test after 1.90 ACH50 pressurization test before R-101 0.056 W(sqm.k) roof R-66 0.086 W(sqm.k) wall R-25 0.228 W(sqm.k) lower floor slab R-10 0.5 W(sqm.k) door/window glass R-8 0.7 W(sqm.k) door/window frame   Certifications/Performance Targets: EnerPHit (PHI-Germany) 2030 https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1503520462767-6JIDS3S8W0YHO746FD4Z/Pays_Den_Haut_Carly_Coulson_Architect_Bruce_Damonte_Photographer_12.jpg PAYS DEN HAUT The construction focus is on the elemental: sun, cellulose, wood, glass, stone, fire, and air. The innovation is the quiet engineering of these basic elements. Allowing the scent of the pine trees, the sound of the wind, the movement of light, and the passage of time, to be the focus of this place. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1503520954945-KM3GFIDZSC3L6BMOD1D0/Pays_Den_Haut_Before_Renovation_Photo.jpg PAYS DEN HAUT Information/Contact: info@coulson.co instagram @coulson_architect download project pdf     © Bruce Damonte Photography © COULSON https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1503520221224-JYRB0AUYRFRN7DX0P9CQ/Pays_Den_Haut_Carly_Coulson_Architect_Bruce_Damonte_Photographer_08.jpg PAYS DEN HAUT There is an ease in knowing one’s home is built to last and requires near-zero maintenance. The exterior materials of local limestone cladding and pavers, stainless steel framing, zinc roof and flashings, and local thermally-treated wood screens and decks are timeless in design and long-lasting. The exterior details were developed for extreme exposure to wind driven rain and hurricane-like storms off Lake Superior and constant freeze-thaw cycles. The window flashing system, rainscreen cladding, and vented roof have multiple air spaces, drainage channels, and weather resistant layers utilizing flexible, compression sealants and smart breathable membranes that have been tested to last 100 years. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1503519845143-JDW1SDW3ZT96KYQ2U1IX/Pays_Den_Haut_Carly_Coulson_Architect_Upper_Floor_Plan_After_Renovation.jpg PAYS DEN HAUT The northern Minnesota climate is extreme with typical January low temperatures between -5˚F and –40˚F. Using simple, low-tech, invisible elements: insulation, passive solar, air sealing, triple-pane glass, and high-efficiency heat recovery ventilation, this renovated home has reduced the peak heating load to just 4300 watts (the equivalent of two hairdryers). A small bio-ethanol ventless fireplace in the living room (a renewable fuel) satisfies this load with minimal use. A 2500 watt electric post-heater in the HRV and 3000 watts of electric mat under floor tile in bathrooms provide a backup heating option. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1503519467119-L6I8GSF7CZ1RTO0MZFOP/Pays_Den_Haut_Carly_Coulson_Architect_Bruce_Damonte_Photographer_03.jpg PAYS DEN HAUT Pays d’en Haut is a modern nest occupying a threshold, between city and wilderness, between a traditional estate community and the bold irregular rock and sea. The renovation engages both of these extremes and interlaces them together into a cohesive whole. Embracing the existing angular building form, but overlaying an order. Balancing stark modernism with a classical formality. Providing the client with the clean modern lines and surfaces, formal symmetry, and traditional warmth they desired, while respecting the context and environment. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1503519129259-0VCVLD1OSYIJP7NB4WOS/Pays_Den_Haut_Carly_Coulson_Architect_Regional_Landscape_Context.jpg PAYS DEN HAUT Climbing the ridge of ancient ledge rock and gazing across Lake Superior, one’s heart is filled with a fierce joy. It is the irresistible pleasure of the wild and far horizons that gives an expansiveness to the soul and a sense of uncounted centuries. Pays d’en Haut is the French explorer's name for this land and that feeling. The great joy of being without boundaries… of exploration… of equilibrium with nature. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1503519885313-ENZKD4KBAFE1H6CM4PAW/Pays_Den_Haut_Carly_Coulson_Architect_Bruce_Damonte_Photographer_05.jpg PAYS DEN HAUT There is a wonderful sense of peacefulness when Pays d’en Haut becomes a snow globe in a winter blizzard and the only heat being used is that stored from the sun which has not been seen for many days. It is more than resiliency. It is a feeling of lightness and freedom. Freedom to enjoy the raw beauty of this harsh climate in comfort, passively and naturally, with almost no fossil fuel use. This near-zero energy home achieves energy independence, economic stability, and simplicity. The energy reductions come from permanent, passive items like sun and cellulose. The energy savings will last the lifetime of the building. The low-tech design does not rely on any complex systems that require monitoring, repair, or replacement. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1503518997487-VY58USXJRXPMKDR39D9S/Pays_Den_Haut_Carly_Coulson_Architect_Bruce_Damonte_Photographer_01.jpg PAYS DEN HAUT Pays d’en Haut “If we can move into an open horizon where we can live in our modern world with ancient dreams that have always stirred us, then our work will have been done.” -Sigurd Olson It is this desire, to live as one with the glaciated rock, expansive lake, soaring hawks, and towering red pines that drew the client, a retired couple, to this existing 3 bedroom 2 1/2 bath home in northern Minnesota. With their move they were downsizing and seeking a simplified lifestyle grounded in nature, efficiency, durability, and well-crafted modern spaces. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1503519681727-PHCO165UCWA3G3VWEGVC/Pays_Den_Haut_Carly_Coulson_Architect_Lower_Floor_Plan_After_Renovation.jpg PAYS DEN HAUT The design re-organizes interior rooms so one interacts with multiple exterior views in every space. Starting at the garage entry hallway the client can now immediately see the lake through a new sliding door opening and guest bedroom picture window. New 14 foot wide lift-slide doors at the lower floor family room and office provide seamless indoor-outdoor living, connecting to a new terrace and capturing the cool lake winds in the summer. The lower floor is ready for aging-in-place with new zero-threshold large doors, a bar/kitchenette by the stair, and a new accessible exterior walkway around the garage. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1503520370620-ALKF37AVN7STK0XHOJCA/Pays_Den_Haut_Carly_Coulson_Architect_Bruce_Damonte_Photographer_11.jpg PAYS DEN HAUT The innovation of Pays d’en Haut is the unseen. It is a patient and slow-moving architecture, resisting the temptations of trends and technology. The design strives for a fluid and open living connection with an extreme climate and beautiful landscape. While working within the constraints of an existing building. Achieving significant energy freedom using invisible, but rigorous, methods. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1503519615745-ZJ4ZQ7WSDZW6MZMG8FVD/Pays_Den_Haut_Carly_Coulson_Architect_Site_Plan.jpg PAYS DEN HAUT The architecture engages with the powerful landscape, improves function and flow, and maximizes built-in storage. Canopies, decks, and terraces were added to enhance the exterior and create a series of new outdoor rooms. A wood slat screen wall weaves the building into the landscape, softens the existing building angles, provides privacy, and creates a barrier at a steep cliff. A new elevated deck is integrated into the building form and landscape without blocking views. An existing front entrance portico was removed to allow a clear sightline of the rock pinnacle from the front yard. A long stone wall and rows of new trees were added to blend with the formal landscape of the street and create a private front courtyard. https://coulson.co/bagley-classroom daily 0.75 2018-01-24 https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1516486056378-EC2T9UAYHFOGHYDKEGNS/University_of_Minnesota_Bagley_Classroom_COULSON_Floor_Plan.jpg BAGLEY CLASSROOM Sustainability is invisible, integrated, elemental. Imagine it is -40°F on a cold January night, yet no mechanical heating is required. The sun provides passive heat. Insulation and airtightness eliminate heat loss. With no heating or cooling load, a small photovoltaic element woven into the architecture can supply all the classroom needs. A re-imagined building typology: classroom, shelter, laboratory, chapel, gathering hall, observation nest. It is transformed hourly for different functions but maintains an order and serenity, even when overflowing with activity. The simple floor plan has a flexible assembly room facing south. Toilets, storage, equipment, and wet lab are to the north. The elegant symmetry and fluid connection to the outdoors creates a calm, meditative space. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1516485363293-QYOGWU222ESRCNQ4VT65/University_of_Minnesota_Bagley_Classroom_COULSON_Paul_Crosby_Photographer_01.jpg BAGLEY CLASSROOM The building feels both ancient and intelligent, with the precision and simple poetry of a classical pavilion nestled in the landscape. Materials are choreographed with emotion and elemental purpose, where every detail contributes to a tightly woven concept. Striving for quiet intensity, like a work of Sibelius, the economy of design and gesture grabs your attention and invites you to listen. Listening to the sun, wind, air, water, soil and forest, Bagley works in perfect balance - worshipping the earth’s resources. With a positive energy in optimism and performance, it has a magical connection with the natural world. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1516486667414-WSYC2KU795YY51WICPNP/University_of_Minnesota_Bagley_Classroom_COULSON_Paul_Crosby_Photographer_02.jpg BAGLEY CLASSROOM COULSON led this groundbreaking effort in poetic design and intelligent performance. Achieving the University of Minnesota’s first LEED® Platinum Certified and Passive House building and receiving national recognition in design excellence with an AIA COTE Top Ten Green Building Award and AIA Minnesota Honor Award. With an academic spirit of discovery and knowledge sharing, the Bagley Classroom has impacted and inspired many. Capturing the nation’s imagination on PBS NewsHour. Pushing the Passive House concept to the forefront of US high-performance architecture. And teaching students with this living building laboratory, motivating them with sustainable leadership. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1516482738846-WN0QP6AQBUWD3MS6P2UY/Bagley_Classroom_COULSON_Context_Plan.jpg BAGLEY CLASSROOM Bagley Classroom “Through a vein of rose quartz at its tip can be read the geological history of the planet, from an old pine stump the ecological succession of the plant kingdom, from an Indian legend the story of the dreams of all mankind.” -Sigurd Olson, Listening Point Positioned near the rocky shoreline of Lake Superior and the urban center of Duluth, the University of Minnesota campus offers a unique wilderness Listening Point. Crossing a threshold one passes a cluster of ancient pines, leaving the campus pavement behind to enter Bagley, a 50 acre nature preserve of luscious boreal forest, dramatic overlooks, bubbling trout stream, and abundant wildlife. One can feel the geological movement in views, water, and glaciated rock towards Gitchi Gami, the largest fresh water lake in the world. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1516593279702-NQENUHVTCC65BZN27W0C/University_of_Minnesota_Bagley_Classroom_COULSON_Paul_Crosby_Photographer_10.jpg BAGLEY CLASSROOM The ancient life force of water is evident everywhere, shaping form, culture, ecosystems, climate, and the serenity of Duluth. The Bagley Classroom honors the lessons and value of water, reducing usage by 87%. No potable water is used for irrigation, and very minimal water is used at toilets and sinks. The nature area and campus drain into streams that flow into Lake Superior. This watershed is teeming with life, including trout, but is at great risk from urban runoff and a warming climate. This previously developed site doesn’t increase stormwater runoff or pollutants into the watershed. A drought-tolerant green roof, new vegetation zones along the walkway, and rock infiltration trenches around the building and patio hold and treat stormwater. Sedums and chives planted on the roof add softness and seasonal color change to the design, increase wildlife habitat, reduce heat island effect, and contribute to super-insulation. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1516552054093-D1X5URXXAS8TBPEQWKNY/University_of_Minnesota_Bagley_Classroom_COULSON_Paul_Crosby_Photographer_09.jpg BAGLEY CLASSROOM The Bagley Classroom is near-zero waste and water. As passionate stewards of the environment, Bagley faculty wanted the waste and water conservation and student learning opportunities that a composting toilet system would provide. It was a first for such a public building in Minnesota, but Chancellor Martin championed the powerful narrative and sustainable example it would set. A vacuum-flush system was installed using 0.04 gallons of water per flush. Tankless toilets connect to treatment tanks in the storage room which faculty and students maintain. Final compost is returned to the earth in campus landscaping. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1516548762502-F1Z3260U7WJ13PH77X0W/University_of_Minnesota_Bagley_Classroom_COULSON_Paul_Crosby_Photographer_08.jpg BAGLEY CLASSROOM The sun provides all we need. Optimal thermal comfort is maintained without active mechanical heating or cooling. The sun and internal heat gains, such as occupants and equipment, provide all the required space heating passively. A tiny 2500 watt electric duct coil in the HRV is the size of a hairdryer and provides backup. However, the building will never drop below 60°F inside, so there is no concern for damage to plumbing or equipment if a blizzard cuts out the sun and power for a week or more. A 5.5 kW photovoltaic array is grid connected and produces approximately 9000 kWh per year for net zero energy. With these simple, low-tech solutions to energy conservation, energy performance and costs are stable and require very little monitoring or service. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1516503583209-5PC1R2VP9QOTXO4WZ5YJ/University_of_Minnesota_Bagley_Classroom_COULSON_Paul_Crosby_Photographer_05.jpg BAGLEY CLASSROOM Metrics: 2012 total sqft gross   36 kBtu(sqft.yr) 114 kWh(sqm.yr) pEUI source energy w/o PV 13 kBtu(sqft.yr) 41 kWh(sqm.yr) pEUI site energy w/o PV 4.6 kBtu(sqft.yr) 14 kWh(sqm.yr) space heat demand 0.47 ACH50 pressurization test   R-64 0.089 W(sqm.k) wall R-85 0.067 W(sqm.k) roof R-54 0.106 W(sqm.k) slab foundation R-5 1.31 W(sqm.k) window frame R-7 0.75 W(sqm.k) window glass R-6 0.88 W(sqm.k) door   54% SHGC   87% potable water reduction 70% artificial lighting reduction 86% FSC wood use 17% recycled content use 15% reused products use 35% local products use 100% low-VOC products use 100% NAUF products use 89% construction waste recycled   60 LEED® points (NC 2.2)   Certifications: LEED® Platinum   Performance Targets: Passive House (PHI-Germany) 2030   Publications/Exhibits/Presentations/Awards: International Passive House Database #1964 AIA COTE Top Ten Green Building Award - 2012 PBS Newshour - April 23 2012 DasHAUS Exhibit - Chicago 2012 GreenSource - Jan 2011 Architecture Minnesota - Jan 2011 Architecture Minnesota - May 2011 Int’l Passive House Conference Publication - 2011 Int’l Passive House Conference Lecture - 2011 AIA Minnesota Honor Award - 2010 ARCHITECT Annual Design Review Award - 2010 ARCHITECT Magazine - Dec 2010 Minnesota Monthly - June 2010   Information/Contact: www.coulson.co info@coulson.co download project pdf     © Paul Crosby Photography   © 2010 COULSON https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1516518396917-EW4VO3R7IAFTQHVSQWUX/University_of_Minnesota_Bagley_Classroom_COULSON_Paul_Crosby_Photographer_06.jpg BAGLEY CLASSROOM A maintenance-free exterior zinc cladding was salvaged from a Minneapolis project and reused at Bagley. Reclaimed, local timber beams have a rich history visible in markings and old-growth grain that connects back to the ancient forest once covering this region. Ipe wood sunshade structures add design warmth and texture, block unwanted heat gain, prevent bird collision, and create a blind or nest to observe the outside world. They are FSC-certified. Triple-pane windows provide super-insulation, air-tightness, passive solar heating, exterior views, natural ventilation. and natural light. Artificial lighting use was reduced by 70%. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1516487219937-37F9RYYX91KD0E6O4O12/University_of_Minnesota_Bagley_Classroom_COULSON_Paul_Crosby_Photographer_03.jpg BAGLEY CLASSROOM Bagley students trace the history of a fallen leaf, feel their paddle cutting through the water of Rock Pond, listen to the magical sound of rain on their tents, brush past snow covered trees on narrow nordic trails, track beaver habitat and hawk migration, taste the pure sweetness of maple syrup they collect, study an aquatic ecosystem teeming with invisible life, write poetry and create art inspired by nature. John Pastor, Ken Gilbertson, and Tim Bates had held daily classes in Bagley for decades, far from any facility to support it. They initiated this project, advocating tirelessly for shelter, storage, restrooms, and minimal impact on their beloved Listening Point. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1516488012927-S4LDUGQV3IIJU28A1S53/University_of_Minnesota_Bagley_Classroom_COULSON_Paul_Crosby_Photographer_04.jpg BAGLEY CLASSROOM In 2008, the visionary leader of UMD, Chancellor Kathryn Martin, issued a challenge: The greenest building in Minnesota. Composting toilets. LEED® certification. She knew the architecture team of COULSON and Salmela Architect would embrace the challenge and take it further. Developing the design and setting the bar for the highest level of LEED® and near-zero energy-waste-water, architect Carly Coulson was mindful that the pursuit of performance must not distract from creating a poetry-of-place and elegant simplicity in operation. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1516484913092-ZJ72G0B3IXOBVD1WYA43/University_of_Minnesota_Bagley_Classroom_COULSON_Context_Image.jpg BAGLEY CLASSROOM Being outside of time and transformed, one emerges into a landscape that is alive. This masterpiece of nature “is a symphony played upon our finest feelings. The secret chords of our being are awakened. We listen to the unspoken. We gaze upon the unseen.” -Okakura Kakuzo Bagley is a gift of contemplation to study deeper meanings and relationships - both scientific and poetic. It is an intimate and majestic place of recreation and rejuvenation “dedicated to recapturing this almost forgotten sense of wonder and learning from rocks and trees and all the life that is found there, truths that can encompass all.” -Sigurd Olson Acting as a vessel to observe the passage of time, seasons, climate, and wildlife, the Bagley Classroom appears mysteriously in the forest like a lost chapel, one dedicated to listening. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1516500478681-RCD8SHB5BEW7AAMG5QHK/University_of_Minnesota_Bagley_Classroom_COULSON_Building_Sections.jpg BAGLEY CLASSROOM The Bagley Classroom was completed in 2010. The design meets the Passive House Institute standard using low-tech strategies of passive solar heating, super-insulation, airtight construction, no thermal bridges, heat recovery ventilation, and summer shading to eliminate heating and cooling loads. This simple, conservation-first approach reduces the total energy demand by 81%. The remaining 19% energy load is supplied with a small photovoltaic system. The result is an incredible resiliency and deep energy savings that will last the lifetime of the building with almost no maintenance. COULSON used disciplined integrative thinking, bold leadership and team collaboration, and advanced energy modeling and building analysis to meet these ambitious targets and seamlessly weave the sustainability and design together. The innovation is the invisible engineering. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1516502346607-DTTRV8212C47XYZW4401/University_of_Minnesota_Bagley_Classroom_COULSON_Construction_Details.jpg BAGLEY CLASSROOM With a less-is-more approach the design elements and materials have been edited to the bare essentials. Every item is solving many multiple issues to meet Passive House, LEED®, functionality, and aesthetics. The roof and walls use a 16 inch SIP (structural insulated panel) system which provides continuous super-insulation, no thermal bridging, is locally manufactured, air-tight, 100% recycled EPS foam, FSC-certified wood, NAUF OSB, and pre-fabricated large format panels which took only 2 days to assemble and enclose on-site. 12 inch EPS insulation surrounding the concrete grade beam and underneath the concrete slab provides super-insulation and is 100% recycled local material. All scrap EPS was returned to the manufacturer to be recycled again. The project construction waste was reduced by 89% using creative strategies like this. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1516593433040-ZDWCPLX1JIXXZMWI0LNU/University_of_Minnesota_Bagley_Classroom_COULSON_Paul_Crosby_Photographer_11.jpg BAGLEY CLASSROOM “From this one place I would explore the entire North, and all life, including my own.” -Sigurd Olson, Listening Point With the Bagley Classroom, the University of Minnesota Duluth has created a profound place of exploration, discovery, and listening; to nature, to each other, to oneself. It was a privilege for COULSON to work with this great institution on a project possessing such depth and distinction; we did so with the utmost passion and determination acting as design and project architect, project manager, LEED® coordinator, interior designer, landscape designer, and passive house designer. It was an honor to work with Kevin Claus and the Facilities Management team who brought their incredible craftsmanship and skill to construct this pioneering building with their own hands. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1516594951893-59QWRP9FASKGXD9WD8HY/University_of_Minnesota_Bagley_Classroom_COULSON_Paul_Crosby_Photographer_07.jpg BAGLEY CLASSROOM Breathing healthy air is essential to well-being and productive learning. This airtight building features a simple heat recovery ventilator (HRV) that provides continuous and balanced fresh air and exhaust using a hospital-grade filter. The airflow automatically adjusts to the number of occupants with CO2 sensors. The system will bypass the heat recovery function in the summer if outside air is cooler than inside for free cooling, typically at night. Bagley is also designed for optional natural ventilation. When windows are open the HRV shuts down, and insulated dampers automatically open high in the equipment tower to draw outside air with a chimney-effect. All finish and building materials are low-VOC with no added formaldehyde. After a thorough cleaning, a 30 day flush-out was performed to eliminate construction activity particulates before occupancy. https://coulson.co/newenhouse daily 0.75 2018-01-24 https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1515599059510-WV1EFYYGTMPUPM8KSTJC/COULSON_NewenHouse_Site_Plan_3x4_300.jpg NEWENHOUSE “Let us be less luxurious, and more magnificent.” -Okakura Kakuzo The first NewenHouse prototype was completed in 2011 on a south-facing downtown lot where it engages the community and offers regular educational tours and building science presentations. The project is Passive House, Energy Star, and LEED for Homes certified. The innovation of the design is that it meets these most stringent criteria in a very cold climate for a construction cost of less than $225,000. How this integrated design puzzle was resolved using common materials, simple details, and low-tech passive strategies is the important lesson and COULSON was honored to lead that effort. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1515640798532-3F5FM7YJY5A7QCCYNJNM/COULSON_NewenHouse_Heat_Demand_Chart_3x4_300_.jpg NEWENHOUSE One hairdryer can heat NewenHouse on a cold January night. The space heating demand was reduced by 90% and the peak heating load of 1400 watts is satisfied with three simple $100 radiant electric panels. The cost saved by eliminating the traditional heating system is swapped for the added cost of super-insulation, triple-pane windows, and airtight construction. COULSON provided this energy design and modeling, construction detailing, mechanical systems design, and passive house certification. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1515608643425-WDI3MB7QBXRD0XZ63MLA/COULSON_NewenHouse_Cube_Construction_3x4_300.jpg NEWENHOUSE NewenHouse is cost effective because the framing sequence is simple and the materials common. In the first phase the cube is constructed like a standard platform-framed house with flat roof using 2x4 wood structural walls with osb sheathing and 2x10 roof joists with plywood roof deck. The osb and plywood create the airtight layer and all seams are taped. Roof trusses with energy heel are installed. This basic structural enclosure is made very quickly, with minimal instruction required and with components from the local lumberyard. All mechanical and electrical are installed in the 2x4 walls and do not penetrate the airtight sheathing. The next phase is the installation of the 12 inch larsen truss using scrap 2x4 and plywood material. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1515623865164-38Z9O01QH0KJUA6XJKKI/COULSON_NewenHouse_Vertical_Section_Detail_4x8_300.jpg NEWENHOUSE Metrics: 1775 total sq. feet 33 kBtu(sqft.yr) 104 kWh(sqm.yr) pEUI source before PV 12.6 kBtu(sqft.yr) 40 kWh(sqm.yr) pEUI site before PV 3.8 kBtu(sqft.yr) 12 kWh(sqm.yr) space heat demand 0.51 ACH50 pressurization test R-60 0.094 W(sqm.k) wall R-94 0.060 W(sqm.k) roof R-57 0.100 W(sqm.k) slab foundation R-4 1.31 W(sqm.k) window frame R-8 0.75 W(sqm.k) window glass 56% SHGC 92% heat recovery efficiency   Certifications: Certified Passive House (PHI-Germany) LEED for Homes Energy Star   Publications/Exhibits/Presentations: Certified Passive House Designer - 2015 Int’l Passive House Conference Publication - 2012 Int’l Passive House Conference Lecture - 2012 International Passive House Database #2173 Mother Earth Living Magazine - 2011 Green Building Advisor - 2011 TreeHugger - 2014 Inhabitat - 2014 La Crosse Tribune - Mar 18 2012   Information/Contact: www.coulson.co info@coulson.co www.madisonenvironmental.com download project pdf     © 2011 COULSON https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1515597772950-BXJOSDO6IFE7QIUAHHVB/COULSON_NewenHouse_Ocooch_Mountains_3x4_300.jpg NEWENHOUSE NewenHouse Traveling to Viroqua, Wisconsin, one experiences the pastoral landscape that architect Frank Lloyd Wright called home. The dramatic rolling hills and exposed rock of the Ocooch Mountains are dotted with small, hardworking farms. The culture is unpretentious and deeply connected to the land and the seasons. Locals celebrate the mild summer and are thankful for the abundant sunshine in the extreme winters. It is no surprise this community is home to the first prototype of NewenHouse, a single-family detached residence developed by Sonya Newenhouse. Like Wright’s Usonian Homes, NewenHouse addresses the challenge to provide affordable, low-energy, and sustainable housing that is easy to build and connected to the sun and climate. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1515603949381-LCKXZ0K28N69QL83TU2U/COULSON_NewenHouse_Building_Section_3x4_300.jpg NEWENHOUSE The insulated enclosure is a compact cube without a basement or heated attic. Heat loss is greatly reduced because the exterior surface area is minimized. The simple form is very cost effective to build. A concrete slab-on-grade foundation, exposed as the floor finish, is surrounded by 12 inches of EPS foam. The additional insulation is cost neutral as the thick foam is also utilized as the concrete formwork. Trusses installed on the top of the cube create a traditional-looking roof and a pitched surface for solar panels. The adjacent screen porch and root cellar expand the summer living space outside and offer unheated storage and tornado shelter. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1515624206727-ZYYKJOOAY5CO7L6OOXE0/COULSON_NewenHouse_Horiz_Plan_Detail_3x4_300+copy.jpg NEWENHOUSE NewenHouse is a kit home. Like the popular Sears, Roebuck and Co. homes, it further reduces building costs by taking advantage of quantity discounts to provide a package of high-performance components for the best value. The kit includes construction documents, custom climate and site analysis, triple-pane windows and doors, airtight tapes, foundation foam raft, heat recovery ventilator, photovoltaic system, solar hot water system, and guidance to purchase local items like lumber and cellulose insulation. NewenHouse includes other high quality and sustainable features such as FSC certified wood, low-VOC materials, recycled and salvaged interior components, energy efficient appliances/lighting, vegetative roof at porch, rain collection system for irrigation, and edible landscape design. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1515624416993-IXNMNLL16SNURKSXX4UR/COULSON_NewenHouse_Larsen_Truss_Detail_3x4_300.jpg NEWENHOUSE NewenHouse utilizes an improved design of the larsen truss that further reduces thermal-bridges and the amount of lumber to maximize insulation value and reduce heat loss. It consists of 2x4 verticals at 24 inches on center, fastened back to the structural wall using minimal plywood gusset plates and 2x4 blocking. The exterior is sheathed with fiberboard. All wall and roof cavities are filled with dense-packed cellulose. The exterior cedar siding has a vented air space behind it and the attic is vented. These are diffuse-open details where the moisture dries to the outside. COULSON completed advanced hygrothermal modeling to verify the moisture performance. The design has a low carbon footprint as cellulose is made from local recycled paper and the FSC lumber was milled locally. When the home has reached the end of its useful life these components can be deconstructed and recycled. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1515599225288-PPH8S3IO1R0JFX8KD4DU/COULSON_NewenHouse_Floor_Plans_3x4_300.jpg NEWENHOUSE Meeting energy and cost goals begins at the schematic design stage when the functional layout and form is finalized. The Usonian Homes were innovative for their open floor plan, borrowed-space strategies, and clever built-ins. Wright knew he must control the house size to achieve economy, so he pushed the efficiency of the plan. Ms. Newenhouse took inspiration from this and the small home movement as she designed her 3 bedroom 2 bath floor plan. The main house is only 1240 sqft (115 sqm) gross over two levels, but functions like a home twice the size. https://images.squarespace-cdn.com/content/v1/54ffa980e4b0542f756ffce3/1515643029981-CJRGZJKZROJOZMU3NITC/COULSON_NewenHouse_Site_Energy_Comparison_3x4_300.jpg NEWENHOUSE The total annual site energy demand before renewable energy is 3300 kWh. This is a 79% reduction in energy consumption compared to the same home built to code. The energy demand is easily supplied by the small photovoltaic system integrated on the roof, and included in the construction cost, to achieve Net Zero Energy. A solar hot water system, with roof mounted panels is also included in the construction cost and reduces the domestic hot water energy by 58%. A tiny HRV (heat recovery ventilator) is located in an upstairs closet and operates continuously with a heat recovery efficiency of 92%. https://coulson.co/contact daily 0.75 2025-07-08