Info on geothermal

Since I get asked this a lot...below is a link to an explanation of how geothermal (ground source) heat pumps works:

 http://www.geoexchange.org/index.php?option=com_content&view=article&id=48:geothermal-heat-pumps&catid=375:geothermal-hvac&Itemid=32 

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