• The International Geothermal Association (IGA)
  Very good site packed with information, data and many links to further information.http://iga.igg.cnr.it/
  
• The Geothermal Resources Council
  US on-line library and geothermal links. http://www.geothermal.org/index.html
  
• International Ground Source Heat Pump Association
  US based information on geothermal heat pumps. http://www.igshpa.okstate.edu/
  
• GeoExchange
  - site of the Geothermal Heat Pump Consortium with information on geothermal, ground source heating and cooling systems http://www.geoexchange.org/
  
• Earth Energy Society of Canada
  This site provides background information for residential or commercial owners who are considering the benefits of earth energy. http://www.earthenergy.ca/
  
• The IEA Heat Pump Centre (HPC)
  an independent international information centre on heat pumps and related technologies such as air conditioning and refrigeration. The HPC operates under the umbrella of the International Energy Agency. http://www.heatpumpcentre.org/
  
• CADDET
  information on full-scale commercial geothermal energy projects http://www.caddet.org
  
• Geothermal Energy Association - a trade association composed of U.S. companies who support the expanded use of geothermal energy and are developing geothermal resources worldwide for electrical power generation and direct-heat uses http://www.geo-energy.org/

• IEA Heat Pump Centre Newsletter
  - journal on worldwide heat pump developments available in full (pdf) and short (html and email) versions. http://www.heatpumpcentre.org.
  

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