You would still need to heat an underground house. The ground temperature usually stays around 50 degrees F. The energy requirements would be much lower, but still present.
Google passive houses or passive heating. Essentially they are houses that are so well insulated that the body heat of the occupants and their activities (cooking, cleaning, bathing) keep the air temperature comfortable. You do need to have an air/ heat exchanger to bring in fresh air, but they take only a fraction of the energy of a traditional HVAC system.
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Today's Featured Article - The Engine Rebuild Kit - by Curtis Von Fange. I always liked engine rebuild kits. They have all the replacement parts for overhauling an engine without going to the store to get gaskets, special measuring tools, or miscellaneous parts. They come neatly packaged, clean and tidy. But it's important not to let that packaging lull you into a false sense of security. The appearance of matching sleeves, pistons, rings, and bearings can cause frustration and agony if not properly measured and installed in a workshop environment. Following c
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