MARTaK: A Colorado Hideway Launches a Business, A Book, and a New Way of Life
Last Updated: Feb 23, 2025When Andrew Michler bought his property near Masonville, Colorado, in the mid-1990s, solar was just beginning to catch on. "People were doing earthships," he recalls, "and 'mass and glass,' meaning lots of thermal glass and lots of mass to heat the structure, as in a passive solar house."
He designed and constructed an off-grid cabin for himself and his wife and later built on an addition. But he found the traditional passive solar approach was uncomfortable. That's when he began learning about passive-house design using the Passive House Institute in Germany as a resource.
Table of Contents
- Why Did The MARTaK House Choose Passive House, not PHIUS?
- How Did MARTaK Use Alternative Building Systems?
- Finishing Touches
- How Has COVID-19 Impacted The Future of Passive House?
"The more I learned about Passive House, the more it seemed the most thoughtful and thorough process for building with outcomes in energy efficiency and for comfort," Michler says. "It's also the only process I've found that's predictable and performance-based." In 2017, he completed the first certified International Passive House in Colorado just steps from his cabin, called MARTaK (an acronym of the couple's names).
The home's "big, strong triangular motif was inspired by Hogback mountains here on the Front Range." Being inside the structure feels like " being inside one of those hills," he adds. The interior has FSC-certified plywood for flooring, shelves, millwork, and cabinets. They crafted the ceilings with reclaimed pickets from a cedar fence and installed concrete and slate floors.
Why Did The MARTaK House Choose Passive House, not PHIUS?
Michler says he found the Passive House Institute's standards in Germany to be a better fit than Passive House Institute US (PHIUS) for what he wished to accomplish.
"The standards are very climate-sensitive," he says. "When we did the energy modeling, we had to use Denver's climate data and add in the elevation at our site. Also, because of microclimates, we're actually warmer than Denver in the winter."
"One of the people who does the climate data modeling stayed with us for a week in October. I showed her how the temperature decreases as we go down the hill, and I got her feedback on how to manage these climate situations. I also learned how to communicate with building scientists."
While Michler believes he ended up "overbuilding in terms of insulation, it was my first go-around with Passive House and my own project. It didn't cost us more money. Actually, the super-insulated structure modulates temperatures really well."
Finishing Touches
The Colorado Hideaway or MARTaK has a 4kw solar array with battery storage of about 6kw hours. In addition to solar heat gain and retention in the winter, the house is heated with a hydronic loop. The hydronic heat is powered by an efficient propane-fired tankless water heater, working in combination with a heat recovery ventilator. The HRV provides the home with continuous fresh air supplemented by an earth tube for summer cooling.
The home uses LED lighting, has a multi-use staircase with cubbies for storage, and decks of reclaimed redwood. Windows frame views of the Rocky Mountains.
A net "bed" hung in the loft space 10 feet off the ground is beloved by young visitors.
Michler says his favorite area of the house is the bath with the sunken shower.
How Has COVID-19 Impacted The Future of Passive House?
As a result of the pandemic, Michler says, "People are relating to their homes in a different way and becoming more aware of the environmental impacts of home building and renovation. The clients who call me are concerned about the environment. They believe in global climate issues and their contribution to them."
In his book, Hyperlocalization of Architecture, Michler writes about Passive House's evolution. Early buildings were simple in style, much like the Colorado Hideaway, Michler's first Passive House project. As designers, including Michler himself, have acquired more experience, "Passive Houses are much more varied in scale and challenging in their design approach." Another innovation in Passive House construction, he adds, is how designers and builders are incorporating materials with less environmental impact. "Low-processed and low-embodied-energy structures are now ordinary," he writes.
As the first certified International Passive House in Colorado, MARTaK was built to "a strict and rigorous energy-efficiency standard," Michler says. The goal of the Passive House Institute, he adds, is to construct buildings, at any scale, that require about 10 percent of the energy "a typical building would use in that environment." Doing so constitutes "a massive leap from what typical buildings do. And they're naturally comfortable."
Camille LeFevre
Camille LeFevre is an architecture and design writer based in the Twin Cities.
