Why Geothermal Free & renewable source of energy - It's already there just waiting to be used It's difficult 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 classic residential systems, it only makes sense. Environmentally 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 offer many tax incentives and discounts that makes your investment in geothermal a reasonable 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. By using our savings calculator, you can discover how much a geothermal system in the , WI will cut your energy costs.