Geothermal systems are a type of heating, ventilation, and air conditioning (HVAC) system that use the constant temperature of the earth to regulate indoor temperature. They consist of a ground loop, which circulates water or antifreeze through underground pipes, and a heat pump, which extracts heat from the fluid and transfers it into the home. Geothermal systems are highly energy efficient, as they use the earth’s natural heat to regulate indoor temperature, rather than relying on external sources of energy such as natural gas or electricity. They also emit little to no greenhouse gases, making them an environmentally friendly choice. In addition to heating and cooling, geothermal systems can also provide hot water and can even be used for pool heating. Despite their initial high cost, geothermal systems often have lower long-term operating costs and provide reliable and consistent performance for many years.