Geothermal cooling
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Other links :
http://energyblog.nationalgeographic.com/2013/09/17/10-myths-about-geothermal-heating-and-cooling/
http://www.climatemaster.com/residential/how-geothermal-works/
http://www.geocomfort.com/about/geothermal-facts
http://www.waterfurnace.com/how-it-works.aspx