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I don't not know the first thing about a heat pump harnessing heat from the earth other than my uncle saying he wants to put one in but needs someone who knows how to do it. Apparently a cousin has one installed.  This sounds intriging and I would think something that should be in during every new construction. Heating 50 degree air as compared to -20 degree air seems advantagous. When next I see my uncle, I will bring up this book. Any thoughts from anyone?