No heating or air conditioning, and yet Cody’s house stays around 72 degrees Fahrenheit. Cody’s website and book explain how he built his ferrocement house. You could build a house like this with earthbags on the sides and ferrocement on the roof.
“It’s winter in the high desert as I write this, and last night the thermometer outside read 9 degrees F (minus 13 degrees C), a bit colder than typical and, ironically, part of the same storm system that left 500,000 people without power in the Midwest. Regardless of single-digit temperatures, my home remained a cozy 72 degrees F (22 degrees C), and it did so without using any conventional energy resources. I have no heating bills of any kind and I don’t burn wood. My home is heated entirely by the free clean energy of the sun, a phenomenon commonly referred to as “passive solar.” Along with orienting my home solar south, I have the proper square footage of windows to match the square footage of my home so that it doesn’t under- or overheat. These windows let in shortwave radiation from the sun that soaks into my stone floor during the day. At night when outside temperatures dip, the stone floor, which is a great conductor of the sun’s energy, re-radiates the stored sunshine, or heat, as long-wave radiation that keeps the house warm. Insulation and thermal mass help retain the heat throughout the night. The process starts anew the next day. Even though my home is dependent on the sun for heat, it’s designed to retain this comfort for several days of cloudy weather or storms.”
Full article at Cody Lundin.com
Note: Cody’s house design works in part because he is in a very mild climate. As Kelly Hart points out, the ground temperature in his area is about 70 degrees, so it takes very little solar gain to keep the house warm in winter. This design would need to be modified for extremely cold and hot climates.
Cody is a world famous survival expert. Search YouTube for Cody Lundin survival videos.