Geo-thermal systems are also referred to as geo-________.

• A. circulation
• B. exchange
• C. ground loop
• D. circuits

Answer: (B)

Geo-thermal systems rely on transferring heat between the earth and the circulating fluid. The term used describes the process itself—heat exchange with the ground—so geo-exchange is the standard name. The earth acts as a stable thermal reservoir, allowing the system to absorb heat from the ground in heating mode and reject heat to it in cooling mode. The ground loop is the physical piping that enables this transfer, but the naming focuses on the exchange of heat. The other options refer to hardware or generic fluid motion rather than the recognized terminology for this system.