Save Money with Geothermal You already purchased your property - why not use the free energy source just below the surface of your yard? A WaterFurnace geothermal system can broadcast an astounding five units of energy for every one unit of electrical energy used. Still not convinced? Look at it this way. You condition your Terre Haute home with free energy - for far less than your neighbors using standard heating and cooling means. We install geothermal products that make use of that free, clean energy lying in your backyard. Get your savings up to 70% on heating and cooling your home - you can even heat your water for no cost during the summer!