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Have you ever wondered why pipes that are used for homes and buildings are dug far under ground? This is not to save space but is done because several feet under ground, the earth has an area that keeps a specific temperature no matter how cold or how hot it is outside. Geothermal Heat Pumps are heating pumps that take advantage of this constant temperature in order to supply heat and cool air to places where there are extreme temperature changes such as it being a sub-zero temperature in the winter and a scorching hot temperature in the summer.... http://solarpoweringeorgia.com/09/geot...