Remember this is about efficiency. The colder it is outside, the more of that increasingly expensive electricity you will use to extract heat from cold air with any type of air-source heat pump. But the ground stays a nice steady temperature of 45 to 75 degress Fahrenheit depending on local climate. Saving money on installation may reduce your return on investment.
This applies to air conditioning too. On those hot summer days you can draw on that nice 55 degree ground, instead of using electricity to push heat back into 97 degree air.
It is all proportional to the temperature difference. Eirik Thorvaldsson (Sent Wednesday, January 28, 2009 10:44 PM
Pipes 10-15 feet underground stay a comfortable 45 to 75 degress. Pipes pass that cool air up to the surface. If its 20 degress, a 45 degree temperature seems pretty nice.
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