The pump room at an apartment building in Fitchburg, Massachusetts.(Credit: MassInnovation)
From CNET:
Sue Butler decided it was time to cut the cord on fossil fuels. So when her aging gas furnace needed replacing, she turned to the Earth for a solution.
She installed a geothermal system--also called a ground-source heat pump, a water-source heat pump, or geo-exchange system--which recently started heating and cooling her Cambridge, Mass. home. Butler said she was motivated by environmental reasons and concerns over carbon monoxide from burning natural gas.
"It's not that much more expensive and I could manage it. And it means no more combustion and it gets the building off of carbon, which is urgent," she said.
Ground-source heat pumps have been around for decades but every year seem to attract more homeowners and organizations who are looking for alternatives to traditional space heating and cooling. They can hook into existing forced hot air and hot water systems but not steam heat.
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