Geothermal heating is a ground source heating and cooling system that uses the ground temperature to heat/cool an antifreeze mixture. At a depth of below four feet, the ground temperature stays a constant 50 to 55 degrees year-round. During the winter, a geothermal system absorbs this extra heat from the earth and transfers it into your home.
During the summer, the system takes heat from indoors and moves it back underground.
Geothermal heating is much more efficient than the standard source of heating because the earth stays at a much more constant temp. Air temperatures fluctuate up and down.