Save Money with Geothermal Why not use 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 pull out an extraordinary five units of energy. Still not convinced? Look at it this way. You condition your Martinsburg home with free energy - for far less than your neighbors using classic heating and cooling methods. We install geothermal products that make use of that free, clean energy lying in your backyard. Realize savings up to 70% on heating and cooling your home - you can even heat your water for free during the summer!