The #1 source for geothermal heating and cooling in Illinois!


Geothermal is the most efficient, environmentally-friendly and best heating and cooling technology available today. Don’t take our word for it. That assessment comes from the U.S. Environmental Protection Agency.

Geothermal takes the earth’s free energy and moves it into your home or business. No gas, no combustion, no flame. Just comfort, with efficiency and economy. Need more information about geothermal? Want to know how to find a qualified contractor/installer? You’ve come to the right place.

The Geothermal Alliance of Illinois (GAOI) is THE source for information about geothermal heating and cooling. GAOI members are:

  • Certified installer-dealers of geothermal equipment
  • Designer engineers of geo systems
  • Manufacturers of geo equipment
  • Loop installers
  • Utilities
  • Others related to the industry


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