Save Money with Geothermal Free energy is waiting to be used and it's only several feet beneath the surface of your backyard. What are you waiting for? A WaterFurnace geothermal system retrieves an incredible five units of energy for each electrical unit of energy used. 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!