Northern Illinois Geothermal Inc. is dedicated to making every geothermal installation absolutely perfect. Precise heating and cooling loads are obtained on every job so that every system is properly designed to reach maximum efficiencies at minimum operating and installation cost. Geothermal is the most efficient heating and cooling system on the planet, geothermal is a renewable energy. Green is a term that is used somewhat loosely these days but Geothermal is a text book example of Green. Please visit our web site at Groundpowered.com for more info or call us at 847 244-2436.