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Most GSHPs use a desuperheater to make hot water. In the summer it makes it for "free" as it removes heat from the loop using only the cost of a small <1/16hp circulator pump.
I'm wondering a duct can be added to the heat pump water heater so it cools the house in the summer but blows outside in the winter?
Maybe if you calculate the smaller wiring or lack of gas piping, the cost may be more reasonable in a new house.
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