Geothermal heating and cooling works on a very simple principle: regardless of how hot or cold it is outside, the temperature in the ground (or a body of water such as a lake or pond) is less extreme. During the summer, the earth is much cooler than the outside air; during the winter, the underground temperature is much warmer than outside temperatures. Our 5 Star Heating & Cooling specialists install proven, dependable Trane "Earthwise" Geothermal Systems that utilize the earth's natural, renewable energy to efficiently heat and cool your home or business. Geothermal Systems help our residential and commercial customers save energy and significantly reduce their monthly heating and cooling costs.