Ground Source Heat Pumps

Here a loop of pipe is filled with a liquid antifreeze fluid and buried underground. The fluid continuously circulates inside the buried pipe absorbing heat energy from the earth and eventually transferring it to the home using the heat pump.

The pipe, or heat exchanger, can be laid in the ground as a horizontal loop or a vertical loop. The choice can depend on the amount of sp ace available or the soil type. A typical borehole depth for a vertical loop is 150 to 200 feet. The majority of geothermal installations are closed loop systems.