NATE Air Conditioning and Heat Pumps Practice Exam 2025 – All-in-One Guide to Master Your Certification!

The primary function of the compressor in an HVAC system is to circulate refrigerant through the system. The compressor plays a crucial role in the refrigeration cycle by increasing the pressure of the refrigerant, which allows it to flow through the system and reach the condenser. This pressure increase also raises the temperature of the refrigerant, enabling it to release heat effectively in the condenser and absorb heat in the evaporator unit. By maintaining this circulation, the compressor ensures that the system operates efficiently and that heat is transferred effectively between the indoors and outdoors.

In contrast, the functions mentioned in the other options are related to different components of the HVAC system. For example, absorbing heat from the indoor air is primarily the role of the evaporator. Condensing the refrigerant from gas to liquid pertains to the role of the condenser, which helps in heat rejection. Finally, discharging heated air indoors is generally associated with the system’s air handling unit or blower, not the compressor itself. Therefore, understanding the unique role of the compressor helps in grasping how the HVAC system as a whole functions to maintain indoor climate control.