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– International Ground Source Heat Pump Association
www.igshpa.okstate.edu
– Geothermal Heat Pump Consortium
www.geoexchange.us
– U.S. Department of Energy Energy Efficiency and Renewable Energy
www.eere.energy.gov
– Geo-Heat Center
geoheat.oit.edu
– National Renewable Energy Laboratory
www.nrel.gov
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www.waterfurnace.com
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