The EPA (Environmental Protection Agency) and the DOE (Department of Energy) concluded 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 harmful to the environment and your family. We know your first priority 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.