What is Geothermal Heating?

From the Video: Geothermal heating takes advantage of the fact that the temperature under the earth's surface remains largely constant, even when the temperature above the earth's surface fluctuates greatly. How does it work to heat a home? A huge hole is dug in the ground and filled with a series of pipes. A special heat-absorbing fluid constantly runs through those pipes. In the winter the fluid absorbs the heat from the earth and pushes it throughout the house. In the summer the process is reversed, where heat from the home is pushed into the pipes and stored in the earth. What are the benefits of geothermal heating? For one, it's economical. You can reduce your heating bills up to 70%. Also, it's good for the environment. Geothermal heating uses no fossil fuels of any kind (oil or gas) and is therefore 100% non-polluting.