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 - Tractor Profile: Allis-Chalmers Model G - by Staff. The first Allis-Chalmers Model G was produced in 1948 in Gasden, Alabama, and was designed for vegetable gardeners, small farms and landscape businesses. It is a small compact tractor that came with a complete line of implements especially tailored for its unique design. It featured a rear-mounted Continental N62 four-cylinder engine with a 2-3/8 x 3-1/2 inch bore and stroke. The rear-mounted engine provided traction for the rear wheels while at the same time gave the tractor operator a gre
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