Geothermal and the Greenville Environment Geothermal products produce no toxic greenhouse gasses such as carbon dioxide into the environment. In addition, they don't produce carbon monoxide to put your family at risk. We understand your utmost concern is the safety and comfort of your home and family. With geothermal systems you achieve both with ease. Need more proof? The EPA (Environmental Protection Agency) and the DOE (Department of Energy) confimed 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.