Sounds like a good direction to investigate but remember the ground isn't the same temperature everywhere, where I live ground water is low 70's. Humidity is very high almost year round. Air conditioning is as much a factor of low humidity as it is low temperature. If I ever build a house I plan to use open loop geothermal AC, it's much more efficient than regular AC.
Geothermal heat pump - Wikipedia, the free encyclopedia
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Michael
Life is the poetry of the universe.
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