U.S. Dept of Energy reports there are many benefits to geothermal
heating systems. Because GHP systems have relatively few moving parts, and
because those parts are sheltered inside a building, they are durable and
highly reliable. The underground piping often carries warranties of 25–50
years, and the heat pumps often last 20 years or more.
http://www.energysavers.gov/your_home/space_heating_cooling/index.cfm/mytopic=12660
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