Geothermal and the Knox County Environment Geothermal products produce no toxic greenhouse gasses such as carbon dioxide into the environment. They also don't produce carbon monoxide to endanger your family. We understand your top priority is the safety and comfort of your home and family. With geothermal systems you attain both with ease. Need more information? 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 condition your home. So, now you know WaterFurnace units are truly a natural green way to live.