A geothermal heating and cooling system utilizes the earth's steady temperature level to heat or cool your home efficiently

https://www.scribd.com/document/873809982/The-Ultimate-Guide-to-Choosing-Energy-saving-HVAC-Systems-146575

A geothermal HVAC system uses the earth's steady temperature to heat or cool your home efficiently, making it an environmentally friendly option with long-term cost savings.