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There is a house down the street that has a closed loop of PEX pipe coiled around the house below the frost line, the radiator from that is on the incoming fresh air from the air to air heat exchanger, the house is super insulated and it takes care of 100% of their cooling needs in the summer and preheats incoming fresh air in the winter.
Because it's a closed loop there is very little resistance other then that of the pipe for the pump to push, no head like you would have with a well, so it takes very little energy to keep the system going.
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