When the old gas furnace/AC dies, some people are opting for the installation of a geothermal system--also called a ground-source heat pump, a water-source heat pump, or geo-exchange system. This is even being done in New England.
Drilling is typically where the expense comes in. The geo-exchange pumps themselves for home run between $17,000 and $30,000. Another problems is this type of system is not well understood by engineers and contractors, but that could be changing.
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