Literal. Algunos ejemplos y referencias:

International Ground Source Heat Pump Association - Down to Earth ...
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Description: Find answers to GeoExchange questions, plus links to more detailed information covering topics such...
Category: Science > Technology > Energy > Devices > Heat Pumps
www.igshpa.okstate.edu/

Geothermal Heat Pump Consortium, Inc.
... For information on geoexchange systems, click here to go to www.geoexchange.org.
To access the Geothermal Heat Pump Consortium's member only area, click here. ...
Description: Information on ground-source heat pump technology, including case studies of applications. Maintained...
Category: Science > Technology > Energy > Devices > Heat Pumps
www.ghpc.org/

IEA Heat Pump Centre
IEA Heat Pump Centre
Description: Information center on heat pumping technologies, applications, and markets. Includes FAQs about heat...
Category: Science > Technology > Energy > Devices > Heat Pumps
www.heatpumpcentre.org/


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Note added at 2003-12-25 23:13:42 (GMT)
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Este texto viene de la primera referencia. Visítelas:

WHAT A GSHP IS AND HOW IT WORKS...


What is a ground source heat pump?
Ground source heat pumps (GSHPs) are electrically powered systems that tap the stored energy of the greatest solar collector in existence: the earth. These systems use the earth\'s relatively constant temperature to provide heating, cooling, and hot water for homes and commercial buildings.