Underground homes are not new. The average temperature inside is about 53 deg.F year round. That makes it much easier to heat even when the temp is well below zero outside. A/C is free in hot weather. Water proofing is very important. You never have to paint the outside of the house. You can be very creative with the entry (your only source for light unless you want to use mirrors to simulate windows to the surface) Don't sell this one short. It's a very good idea. I've seen some with circular glass walled central atriums with gardens and skylights; very beautiful designs.
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