Save Money with Geothermal Free energy is just sitting there 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 pulls an astounding five units of energy for each electrical unit of energy used. Still not convinced? Look at it this way. You condition your Grinnell home with free energy - for far less than your neighbors using conventional heating and cooling procedures. We put in your home geothermal products that put to use 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!