Save Money with Geothermal You already own the property - why not use the readily available energy source just underneath the surface of your yard? A WaterFurnace geothermal system can broadcast a staggering five units of energy for every one unit of electrical energy used. Still not convinced? Look at it this way. You condition your East Tennessee home with free energy - for far less than your neighbors using standard heating and cooling methods. We put in your home geothermal products that utilize 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 free during the summer!