Geothermal well head
Geothermal systems--more correctly called ground source heat pumps--are one of the most efficient ways for heating and cooling buildings. They work by pumping water from wells, which can be hundreds of feet underground, into a heat pump to cool or heat air. This photo shows the inside of a well that would be placed underground.
March 21, 2011 1:50 PM PDT
Photo by: Martin LaMonica/CNET
| Caption by: Martin LaMonica
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