Why Geothermal Use what's already there - free & renewable supply of energy Geothermal energy is the better way to heat and cool your home or business - it's efficient, cost-effective, and protects the environment. It's hard to get much greener than with WaterFurnace. Just ask the EPA - they concluded geothermal energy is the most environmentally conscious heating and cooling system. Or ask the U.S. National Renewable Energy Laboratory - they also confirmed that geothermal energy is more efficient and inexpensive than conventional 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, cheaper and eco-friendly. Want to know the amount of money a geothermal system in Knoxville, TN can save you in energy costs? Check out our geothermal savings calculator and learn more!