Which component of an HVAC system is primarily responsible for distributing air throughout a building?

The component primarily responsible for distributing air throughout a building is the blower fan. The blower fan plays a crucial role in the HVAC system by moving air into and out of the system, circulating conditioned air through the ductwork and into different rooms. It ensures that the air reaches various parts of the building efficiently, maintaining comfort levels by providing the necessary airflow for heating or cooling.

While the compressor is integral for compressing refrigerant in cooling systems, and ductwork serves as the pathway through which the air is delivered, it is the blower fan that actively creates the movement of air. Similarly, the evaporator coil's main function is to facilitate heat exchange, but it does not participate in the distribution process itself. The combined function of these components contributes to the overall effectiveness of an HVAC system, but it is the blower fan that directly handles the distribution of air within the space.