An Inexpensive, Earth-Sheltered, Passive Solar House

The Kalmers’ earth-sheltered, passive solar house is made out of many free and inexpensive materials, and cost less than $10 per square foot.

Earth Sheltered Kalmer Household
The Kalmers added an attic to give the home extra insulation, as well as a south-facing slope on which to put a solar hot water collector.
Photo by Doug Kalmer