The Ground Water System
Ground Water Systems (Open Loop) have been utilizing the earth's natural heat source/heat sink ability for over 40 years. Ground Water Systems draw water from an aquifer via a supply well, pass through the Geothermal heat pump's heat exchanger where heat is exchanged with the refrigerant inside your unit, then returned to the aquifer via a return well or simply disposed of per local code. Ground water temperatures remain very constant (usually within a degree) throughout the year despite wide variations in outside air temperature, therefore your unit will maintain it's super high efficiency no matter how hot or cold it is outside. Ground Water Systems are ideally suited for homes that have existing water wells available or a good potential source for well water. When ground water is available this system usually has the lowest installed cost.