Why Geothermal Use what's already there - free & renewable supply of energy 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 determined geothermal energy is the most environmentally friendly heating and cooling system. Or ask the U.S. National Renewable Energy Laboratory - they also concluded that geothermal energy is more economical and cost-effective than traditional residential systems. Or ask the federal, state, and local governments and utilities - they're offering 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 switching 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 smarter, cheaper 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!