What is the effect of a malfunctioning blower motor on HVAC system performance?

A malfunctioning blower motor significantly impacts HVAC system performance by causing inadequate airflow, which leads to a reduction in both heating and cooling capacity. The blower motor is responsible for circulating air through the system's ducts; when it is not operating properly—whether due to mechanical failure, electrical issues, or other problems—the airflow can be restricted or halted altogether.

This inadequate airflow means that conditioned air (either heated or cooled) cannot effectively reach various areas of a building, creating uneven temperatures and discomfort. Additionally, the HVAC system struggles to maintain the desired indoor climate, which can lead to longer run times and increased wear on the system as it tries to compensate for the lack of airflow.

Moreover, the improper airflow can disrupt the balance of the system, potentially causing other issues like overheating of the heat exchanger or freezing of the evaporator coil, further compromising the system's efficiency and lifespan. Thus, the performance of the HVAC system is directly tied to the efficiency of the blower motor, making it critical for proper operation.