What is a geothermal system?
This explanation is courtesy of Jensen Well Company's web site:
“Geothermal” literally means “heat of the earth.” With a geothermal system, a series of pipes is buried under the ground’s surface to tap into the earth’s natural heat. The underground heat source that can be found in any backyard is enough to cover approximately 10 times the amount of energy required during any season. This unending resource is constantly recharged by the sun and the surrounding earth, so you never have to worry about waning resources.
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