The earth is a wonderful source of heat. Just ask the burrowing animals that depend on it for warmth in the winter. In fact, the earth stores 47 percent of the solar energy that reaches us, making it a natural source of heat for our homes, if we can get it out. And we can. Geothermal heating and cooling systems -- also called geoexchange, earth-loop, or ground-coupled heat pumps -- move the heat from the ground into your home - (Read more)