International Ground Source Heat Pump Association (IGSHPA)
The International Ground Source Heat Pump Association is a non-profit, member driven organization established in 1987 to advance geothermal heat pump (GHP) technology on local,state, national and international levels. http://www.igshpa.okstate.edu/index.htm
Geothermal Technologies Program - Geothermal Heat Pumps
The geothermal heat pump, also known as the ground source heat pump, is a highly efficient renewable energy technology that is gaining wide acceptance for both residential and commercial buildings. Geothermal heat pumps are used for space heating and cooling, as well as water heating. Its great advantage is that it works by concentrating naturally existing heat, rather than by producing heat through combustion of fossil fuels. http://www1.eere.energy.gov/geothermal/heatpumps.html
