Save Money with Geothermal Why not maximize the free energy located just a few feet underneath 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. Not quite sure what that means to you? What you get is an economical means to condition your Lime Springs home - much less than what your friends and neighbors will pay. The geothermal products we install are the most proficient equipment on the market today. So why not utilize the clean, renewable energy in your backyard and realize savings up to 70% on heating, cooling, and even hot water!