Why Geothermal Use the existing supply of free & renewable energy just beneath the surface Geothermal energy is the smarter way to heat and cool your home or business - it's efficient, cost-effective, and environmentally friendly. It's hard to get much greener than with WaterFurnace. Just ask the EPA — they concluded geothermal energy is the most environmentally conscientious heating and cooling system. Or ask the U.S. National Renewable Energy Laboratory - they also determined that geothermal energy is more efficient and cost-effective than classic residential systems. Or ask the federal, state, and local governments and utilities - they're providing many rebates and tax incentives that will only add to your investment in geothermal. Or, most importantly, you can speak with your neighbors - more and more people are changing to geothermal and love it! Energy and cost savings will vary by region and depend on the type of old system your new geothermal is replacing. However, geothermal will always be the best option, more cost effective and environmentally friendly. By using our savings calculator, you can find out how much a geothermal system in the Maryville, TN will reduce your energy costs.