Although they're still far from familiar, ground-source heat pumps have been installed for more than 30 years throughout the U.S. Also called geothermal heat pumps, they are recognized by the EPA and the DOE as the most efficient heating and cooling systems available today.

"Geothermal heat-pump technology offers a renewable energy solution that's right for almost any home," says Gemma Tiller, owner of Air Brokers Hvac, LLC, based in Branson, Mo. "Thermal energy is harvested from the earth and transferred into buildings by a heat pump that provides heating and cooling." Despite misconceptions...

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