The Theory Behind Geo Thermal
The science is simple. The earth soaks up 47 percent of the solar energy that reaches us, meaning that as close as six feet underground the temperature is a constant 46-50 degrees year round, warmer than the outside air in winter and cooler in the summer. Geothermal heating systems move heat from the ground into your home in the same way your refrigerator takes heat from the food stored inside and moves it out into the room.
In your basement, a typical geothermal system will probably look much like a conventional fossil fuel furnace. Inside, however, the usual burners have been replaced with a refrigeration system that removes heat from liquid circulated underground. The heat is then blown through traditional forced air ductwork in your house.