Christopher Gearon/ The Washington Post
Jan. 31, 2011
Just before Thanksgiving 2009, my family began heating and cooling our 4,400 square foot home with geothermal energy. As I wrote in a story that appeared in Health + Science last March, we got rid of our 24 year old oil burning furnace and traditional air conditioning, and replaced them with a system based on drawing moderate temperatures from beneath the Earth's surface.
Geothermal bill: $23,950 (savings using looped coils vs. deep-drilled loops)
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