The secret of a WaterFurnace system's clean, efficient operation is the earth's ability to store heat. In fact, 47 percent of the sun's energy that reaches our planet is absorbed into the earth. That's 500 times more energy than all of humanity would need in a year! And it's an unlimited source of energy. Want to know how environmentally awesome these geothermal heating and cooling systems are? Installing one of them is the equivalent of planting 750 trees, or taking 2 cars off the road. So what is geothermal energy? It is an unlimited natural resource that exists everywhere. The earth contains huge amounts of thermal energy that is constantly fed by the sun. By using the earth to provide up to 50 percent of a building's total heating and cooling needs, WaterFurnace systems are truly geothermal energy made practical.
Some excerpts taken from WaterFurnace.com