How Does it Work?

Half of the sun’s energy is stored in the crust of the earth like a solar battery, and once an earth loop is placed below the frost line where the earth temperature doesn’t vary, it will be able to absorb heat in the winter and reject heat in the summer.  In Minnesota at 6 to 8 feet underground the earth’s temperature is always a stable 48-52F.  So even in Minnesota’s harsh winter climate, the earth below the frost line remains constant, providing  you with as much heat needed to heat your home or building.

Heating Cycle

Geothermal heat pumps can be categorized as having closed or open loops, and the closed loops can be installed in three ways: horizontally, vertically, or in a pond/lake. The type chosen depends on the available land areas and the soil and rock type at the installation site. These factors will help determine the most economical choice for installation of the ground loop.

For closed loop systems, water or antifreeze solution is circulated through plastic pipes buried beneath the earth’s surface. During the winter, the fluid collects heat from the earth and carries it through the system and into the heat pump. The heat pump then converts that energy into usable heat through the refrigeration process.  During the summer, the system reverses itself to cool the building by pulling heat from the building, carrying it through the system and placing it in the ground. This process creates free hot water in the summer and delivers substantial hot water savings in the winter.

Cooling CycleOpen loop systems operate on the same principle as closed loop systems and can be installed where an adequate supply of suitable water is available and open discharge is feasible. Benefits similar to the closed loop system are obtained.





Here is a general overview of all the great benefits that geothermal heat pumps can offer its owners: