Why Geothermal Use what's already there - free & renewable supply of energy It's not easy to get much greener than WaterFurnace. A smarter method to heat and cool your home or business, geothermal is... Efficient - With the U.S. National Renewable Energy Laboratory confirming that geothermal heating and cooling is more efficient than traditional residential systems, it only makes sense. Eco-friendly - The EPA determined that geothermal energy is the most eco-friendly heating and cooling system on the market today. Cost-effective - State, Federal and local government and utilities offer many tax incentives and rebates that makes your investment in geothermal a well-informed choice. Still not satisfied? You can ask your neighbors - more and more people are switching to geothermal and love it! Energy and cost savings will vary by region and the type of system geothermal is replacing, but geothermal will always save you more money, smarter, and greener. By how much can a geothermal system in the Charleston, SC area save you in energy costs? Use our geothermal savings calculator to discover for yourself!