The Department of Energy (DOE) and the Environmental Protection Agency (EPA) have both endorsed geothermal heat pump systems as among the most energy efficient, environmentally clean, and cost effective systems for temperature control. Homeowners can expect to enjoy a comfortable, reliable, and economical system while also reducing energy use and pollution. When you consider the durability, comfort, cleanliness, and energy savings it is obvious why the government has endorsed them as the best systems for temperature control!