Mark Feldman is an architect/builder who has designed solar houses in New Mexico for over 30 years - we've known each other for most of that time. I've always thought how wonderful it would be to ask Mark to build a house for us.
What an interesting process this is - we met with Mark a couple of times, told him what we liked and didn't like, sent some emails and photos back and forth and voila! the drawings appeared. They were a perfect depiction of what we had been vaguely describing.
This page shows the second generation sketches. We started out with 1500 sq feet, then started adding a foot here and there, another closet and - look what happened! 1700 sq feet.
The house will be heated most of the time only with passive solar techniques. In addition, there will be photovoltaics, batteries and a generator back up so that we will not even connect to PNM. That's excellent, as the costs of a new power pole and transformer from PNM were about equal to the price of the solar system.
Michael and I are Californian and New Mexican. Both design influences show in this house. Michael is a big fan of Eichler homes, reflective of mid-century Californian architecture. My childhood was spent in a similar type of home in California, before moving into an adobe in New Mexico. Key features of those California homes were window walls bringing the exterior inside, open design with post and beam construction, the use of mixed materials and horizontal lines referencing Frank Lloyd Wright. From New Mexico, we bring the mass of the trombe walls, the exterior and interior woods and stucco, the galvanized metal roof. And the extraordinary sun, of course, that makes this all possible.
The key to design of this house is in the East Elevation:
The walls of windows and glass doors in this view all face to the East (the walking ditch and the mountains). The slanted roof up to the left is over the living room, and brings in a ton of southern heat and light. The slanted roof in the other direction is over the upstairs master bedroom. That roof is covered with the photovoltaic panels. In the lower right of this drawing, you can see the slanted garage roof line, but that changed completely this week : )
I've learned that's what you can do in architecture; move entire floors by several feet at a time, or just erase rooms.
The key to the energy efficiency of this house is in the South Elevation:
Hard to read at first. The very tall windows on the right are the southern wall of the living room. The bottom two thirds of those tall windows are trombe walls (glass over a solid mass such as adobe or concrete). The top third are glass to allow sun to enter during the winter months (and for light and views of the sky). The top squares on the slanted upstairs roof are the photovoltaic panels. That roof slides all the way down until it creates an overhang in the middle of the wall for an entry way porch. The left hand trombe and glass windows are the downstairs master bedroom suite/office.
Here's the downstairs floor plan:
You can see the entry porch I mentioned, as well as the other rooms. The dotted line in the interior great room/dining area is a wooden cross beam. The dramatic slanted roof over the great room would be at the tallest at the base of this drawing, over the trombe wall. The triangle in the lower right corner is a gas fireplace, efficient, to add back up heat when needed. The staircase is completely open to the great room. The dotted lines outside the building are possible overhangs on some of the roof lines. Mark is working on both the climate efficiencies and the "look" with those overhangs. See the Western and Northern elevations below for a sense of that.
Here's the upstairs master bedroom suite with a deck to the East. This is the room we expect to pick up really beautiful mountain and sky views.
The look and feel of the interior will be a mix of California and New Mexico also. The downstairs floor will be poured dark brown highly polished concrete, with a variegated color. That material has become very popular here and is quite beautiful when done well. The stairs and support beams will be wood. The walls and ceilings will be sheetrock, paint colors unknown (Michael says white :). The trombe wall will be thick of course, because of the mass it requires, but all the other walls will have some sense of mass, also, as they will be built of 2 x 8's. Mark insulates to R-30 on walls, R-50 on the roof, to assist with the energy conservation.
In the garage, in the downstairs floor plan, you can see storage for the batteries which will allow us to store our daytime solar harvest. The generator, back behind the garage, is for back up during high usage or emergency. All of this has gotten a little more possible, with the advent of good LED bulbs and energy efficient appliances. I drive a plug-in Prius, so that challenged us a bit more. The Prius sucks up a good 3 kilowatt hours every night. However, driving it will be even more fun after this, since it will be charging off the photovoltaics.