Geothermal Heat Pump Energy - How It Works
Geothermal Heat Pumps by Sunteq/Enviroteq
http://www.geothermalheatpump.com/how.htm

Geothermal Heat Pump Systems
Geothermal Heat Pump Systems - How does a geothermal heat pump work, diagram of a geothermal heat pump - Everything you need to know about geothermal heat pumps.
http://www.geothermal-heat-pump-resource.org

Water and Energy Systems Corp
Commercial and residential geothermal heating and cooling systems and water heating systems and GeoExchange heat pumps serving all of New England; Connecticut, Maine, Massachusetts, New Hampshire, New York, Rhode Island and Vermont
http://www.northeastgeo.com

Geoexchange
Information on the technology from the U.S. Geothermal Heat Pump Consortium. Includes detailed case studies of applications, publications, statistics and facts.
http://www.geoexchange.org/

Southern Methodist University Geothermal Lab
Information about heat flow, temperature logging, geothermal resource assessments, and education.
http://www.smu.edu/geothermal/

Spontaneous Flow Heat Pump
Le Site de la pompe a chaleur a ecoulement spontane
http://www.new-energy-paces.com

Hydron Geothermal Systems
Design, consulting and sales of geothermal systems using stainless steel heat pumps . Projects include residential, industrial and commercial applications. Service area includes Michigan, Indiana and Ohio.
http://www.hydrongeo.com/

Geothermal Heat Pump Consortium
Nonprofit organization engaged in implementing the National Earth Comfort Program a collaborative effort between the US Department of Energy, the US Environmental Protection Agency, and private sector organizations interested in promoting the growth of energy-efficient, environmentally friendly heating and cooling technology.
http://www.ghpc.org/

Enertran Inc
Canada. Specializes in energy transfer equipment and systems. Includes geothermal heating and cooling units, such as dehumidifiers, drying machines, heat pumps, and heat recovery products.
http://www.enertran.ca

International Geothermal Association
Information on geothermal energy in use around the world, world conferences on geothermal, and links to related web sites.
http://iga.igg.cnr.it/index.php