Direct Geothermal
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Ground loop of water for geothermal, buried 4-8 feet. Not including heat pump.
For integration with heat pump - we would need to cut in to a heat pump hot or cold line in water - approximating the finned air-to-air heat exchanger of standard heat pumps. This allows us to tap ground-loop constant temperature for cooling/heating the exterior coils, or in winter allowing for lower energy use due to constant temperature of ground source water. This is complicated, so a good start is simply using water for trapping the heat/cold of an air-to-air heat pump.
This is the ultimate cheap Thermal Battery.