An Open Loop geothermal system utilizes the earth’s natural heat stored in the ground water deep below the earth’s surface. Open loop ground water systems are ideally suited for homes that have existing water wells available or a good potential source for well water. Open loop geothermal systems draws 55°F well water as the source of heat in the heating mode. Since ground water temperatures remain very constant throughout the year despite wide variations in the outside air temperature, your unit is capable of maintaining it's efficiencies no matter how hot or cold it is outside. The water is 
pumped from your well into the geothermal unit located inside the house water through a heat exchanger located in the geothermal unit. Then the heat from the ground water is transferred into the refrigerant (freon) inside the geothermal unit. The heat in the refrigerant is then sent to a radiator coil which in turn transfers the heat into the air that is distributed throughout the ductwork. During the air conditioning mode the system provides cool dry air to your home. When ground water is available this system usually has the lowest installation cost.
