What is refrigerant used for?

Refrigerant serves a crucial role in heat pumps and air conditioning systems by transferring heat. In these systems, the refrigerant absorbs heat from the indoor environment and carries it outside, or vice versa, depending on whether cooling or heating is needed. This heat transfer process occurs as the refrigerant changes states from liquid to gas and back again, efficiently moving thermal energy and enabling the HVAC system to maintain comfortable indoor temperatures.

Understanding the role of refrigerant underscores its importance in the overall operation of HVAC systems, as well as the need for proper handling and maintenance to ensure system efficiency and effectiveness. The other options, while relevant to HVAC systems, do not accurately reflect the primary function of refrigerants in thermal management and temperature regulation.