Geothermal and the Defiance Environment Worried about the environment? Sure, we all are. By choosing a geothermal product you emit 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 safety for your family just makes good sense. You attain both when you choose geothermal. Here are some agencies that agree. 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 condition your home. So now you know WaterFurnace units are truly a natural, green way to live.