You can learn more about geothermal technology with the links listed below.
Econar Energy Systems Corporation
International Ground Heat Pump Association / IGSHPA
Geothermal Heat Pump Consortium / GeoExchange
US Department of Energy - Geothermal Energy State Technical Site
Electric Power Research Institute Heat Pump Page / EPRI
Energy Efficiency and Renewable Energy Network - Geothermal Program
ARI Air Conditioning and Refrigeration Institute
EPA Energy Star Program
Weather data including heating and cooling degree days
EPA Global Warming Site
US Environmental Protection Agency
International Ground Heat Pump Association / IGSHPA
Geothermal Heat Pump Consortium / GeoExchange
US Department of Energy - Geothermal Energy State Technical Site
Electric Power Research Institute Heat Pump Page / EPRI
Energy Efficiency and Renewable Energy Network - Geothermal Program
ARI Air Conditioning and Refrigeration Institute
EPA Energy Star Program
Weather data including heating and cooling degree days
EPA Global Warming Site
US Environmental Protection Agency
The following links are reference to incentive and rebate programs within Minnesota and Wisconsin.