Save Money with Geothermal Why not use the free energy located just a few feet beneath the surface of your own property? A WaterFurnace geothermal system can use one unit of electrical energy to generate an phenomenal five units of energy. Still not convinced? Look at it this way. You condition your Knox County home with free energy - for far less than your neighbors using standard heating and cooling procedures. We put in your home geothermal products that make use of that free, clean energy lying in your backyard. Grab a hold of savings up to 70% on heating and cooling your home - you can even heat your water for no cost during the summer!