Geothermal and the Grinnell Environment Concerned about the environment? Sure, we all are. By choosing a geothermal product you produce no toxic greenhouse gasses such as carbon dioxide into your environment. Your family's safety is utmost to you and we understand that. Providing a place of comfort and protection for your family goes hand in hand. You can have both when you choose geothermal. Here are some agencies that agree. 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.