Why Geothermal Use the existing storehouse of free & renewable energy just beneath the surface It's difficult to get much greener than WaterFurnace. The best method to heat and cool your home or business, geothermal is... Efficient - With the U.S. National Renewable Energy Laboratory concluding that geothermal heating and cooling is more efficient than conventional residential systems, it only makes sense. Environmentally friendly - The EPA determined that geothermal energy is the most Earth friendly heating and cooling system in the industry today. Cost-effective - State, Federal and local government and utilities provide 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 be more cost effective, wiser, and greener. How much can a geothermal system in the Grinnell, IA area save you in energy costs? Use our geothermal savings calculator to find out!