How Geothermal Works No matter what climate you live in, the temperature throughout the year varies. For some climates that means hot summers that cool to ice-cold winters, and San Antonio is no exception. What most people don't understand is that the temperature underground (regardless of climate or season) stays fairly consistent all year. The ground is able to sustain a higher rate of temperature consistency because it absorbs 47% of the sun's energy (heat) as it hits the Earth's surface. WaterFurnace geothermal systems are able to extract this free energy with an earth loop. This technology is then put to use to provide your home or office with central heating and cooling. Geothermal Heating During the heating cycle, a WaterFurnace geothermal heat pump uses the earth loop to draw heat from the ground. As the system pulls heat from the loop it circulates it through a standard duct system as warm air. The same heat energy can also be utilized for a radiant floor system or domestic hot water heating. Geothermal Cooling Cooling the air is just the reverse process used in the heating cycle. Warm air is pushed by the geothermal heat pump into the ground. By removing the warm air, all that is left is cool air radiating throughout your home. There is no cost to heating your water during this process. For more information on how to get started with a geothermal system in the San Antonio area, contact Southwest Mechanical Services. Start saving on your energy bills today.