More on Geothermal
From: Sharon Villines (
Date: Mon, 28 Jan 2008 11:52:19 -0800 (PST)
More information on geothermal from one of our residents who worked on the planning of our system:

The best place that I know to learn about Geothermal (or "Ground Source") Heat Pumps
is and they have handy tools for finding
certified, recommended engineers and installation companies.

If you have the opportunity to install the ground loops (say, under a piece
of undeveloped land) then you should give Geothermal some strong
consideration. Compared to electric heat, the system is something like five
times more efficient -- that is, five times more heating of a home is
produced for one unit of electricity consumed. For cooling, the efficiency advantage is less but still significant because you are rejecting the heat from your home to a much cooler reservoir (the 55-degree earth) compared to the reservoir of a conventional air conditioner (the air at, lets say, 90 degrees.) For your specific site, you'll be discussing heating-degree days and cooling-degree-days with your engineer, but the upshot can be remarkably
lower electric bills and proportionately lower environmental impacts.

Sharon Villines
Takoma Village Cohousing,Washington DC

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