Geothermal and the Medina Environment Geothermal products produce no harmful 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 primary concern is the safety and comfort of your home and family. With geothermal systems you attain both with ease. Need more proof? 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.