Save Money with Geothermal Why not utilize the free energy located just a few feet below the surface of your own property? A WaterFurnace geothermal system can use one unit of electrical energy to generate an remarkable five units of energy. But what does that mean for you? It means you can condition your Topeka home for far less than your neighbors and friends. The equipment we place in your home is the most efficient geothermal products available. Homeowners can realize savings up to 70% for heating, cooling, and hot water!