A ground-source heat pump does not burn any fuel to create heat. It simply transfers the earth's energy to your home. At the earth's constant temperature of 40 to 50 degrees, a loop through the earth, coupled with an indoor heat pump (about the size of a conventional furnace), provides 300% efficient heat. The heat pump can be connected to ductwork or hydronic tubing. In the summer, you flip the switch to reverse a ducted system for air conditioning.

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