Geothermal systems
These systems use 40 to 70 percent less energy to heat and cool buildings than conventional systems do. How they work:
March 30, 2009
Click on the thumbnail to see the full image.
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These systems use 40 to 70 percent less energy to heat and cool buildings than conventional systems do. How they work:
Click on the thumbnail to see the full image.
.
.
.
.
.