Ground source heat pump
Ground-source heat pumps, or geothermal heating and cooling, draws heat from the ground to heat or cool a building. A liquid circulates through coils that becomes the temperature of the ground. That liquid is compressed and turned into a gas, a process that releases heat. Then the hot gas is circulated through the top chamber where a fan blows the heat through ducting into the house. The gas is then compressed back into a liquid and sent back through the coils in the ground.
October 9, 2011 7:27 AM PDT
Photo by: Martin LaMonica/CNET
| Caption by: Martin LaMonica
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