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My understanding is that you would use the 55-60 deg-F earth has a huge heat sink. In a normal A/C unit you have to compress the freon, this is where most of the energy cost comes from. If you install a bunch of underground piping that is filled with water or air you can move this air or water for a much lower cost than compressing refrigerant. No propane needed just air or water.
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1980 SC
71 Chevelle SS454
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