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The first home was a passive solar home using thermal mass blocks of 85% recycled styrofoam and 15% concrete mix. It also used radiant floor heating and was "on grid" though it was highly energy efficient. Next we visited Dave Tonsing's earthship which is 100% off-grid and fully uses sustainable energy--solar for electric and passive solar for heat. Dave has built 10 earthships in the valley and consulted on three more and was a wealth of information.
The final home of the Solar tour was an adobe home that is nearly completely passive solar, but they added a small wood stove to get them through times when indoor temperatures occasionally drop to the low 50's. I was pleased to make new friends in Custer County and particularly to make contact with professionals who can help me build an earthship on my property.
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