Heat pumps have annually outsold gas furnaces for several years now, and with the recent introduction of more high-efficiency, cold-climate, air-source heat pumps, that trend is likely to continue.
CLIFFORD, N.D. — In 1991, Nancy Drew and her husband Jim Erickson installed a ground source heat pump on the family farm while completely remodeling the house. "It was just a smarter system than fuel ...
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