Why Geothermal Use the existing surplus of free & renewable energy just beneath the surface It's hard 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 concluding that geothermal heating and cooling is more efficient than well-known residential systems, it only makes sense. Eco-friendly - The EPA determined that geothermal energy is the most Earth friendly heating and cooling system on the market today. Cost-effective - State, Federal and local government and utilities provide many tax breaks and reductions that makes your investment in geothermal a well-informed choice. Still not satisfied? You can talk to 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. By using our savings calculator, you can find out how much a geothermal system in the Port Washington, WI will reduce your energy costs.