What role does the blower motor play in an HVAC system?

The blower motor is a crucial component of an HVAC system responsible for circulating air through the ductwork. When the heating or cooling system is activated, the blower motor receives a signal to start operating, drawing air from the return ducts and pushing it through the heat exchanger in winter or through the evaporator coil in summer before distributing it back into the living spaces. This circulation of air helps maintain a consistent and comfortable temperature throughout the building and ensures proper airflow for efficient heating and cooling.

The other options point to functions that are not performed by the blower motor. The heating of air in the furnace occurs in the heat exchanger, the air filter is designed to trap particulates before they enter the system, and refrigerant flow is managed by components like expansion valves or compressors rather than the blower motor itself.