The EPA (Environmental Protection Agency) and the DOE (Department of Energy) determined that geothermal heat pumps are the most environmentally friendly and cost-efficient way to heat and cool your home. Geothermal systems spew no carbon dioxide, carbon monoxide, or other greenhouse gasses that can be dangerous to the environment and your family. We know your primary concern is to keep your home and family safe and comfortable - now you can do that as well as helping the environment. WaterFurnace units are truly a natural green way of life.