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It's NOT geothermal. Geothermal's when you have a hot spring or similar source, and use the heat directly - your only energy cost is a little bit for pumping water through the system. (And geothermal doesn't do a thing for cooling.) Those are ground-source heat pumps, an entirely different technology. They are, as you say, a good way to reduce heating costs, and they can be used for cooling in the summer, but calling them geothermal is at best a mistake, if not false advertising.
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