Save Money with Geothermal You already purchased your property - why not use the readily available energy source just below the surface of your yard? A WaterFurnace geothermal system can broadcast a staggering five units of energy for every one unit of electrical energy used. But what does that mean for you? It means you can condition your Kalkaska home for far less than your neighbors and friends. The equipment we install is the most efficient geothermal products available. Homeowners can actually get savings up to 70% for heating, cooling, and hot water!