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 utilize one unit of electrical energy to pull out an extraordinary five units of energy. Unsure of what that means to you? What you get is an proficient means to condition your Charleston home - much less than what your friends and neighbors will pay. The geothermal products we install are the most economical equipment available 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!