What does an air handler do in an HVAC system?

In an HVAC system, the air handler serves the essential function of circulating air through the ductwork. It is equipped with a blower or fan that moves air over the heating or cooling elements and distributes this conditioned air throughout the building via the duct system. This circulation is crucial for maintaining consistent temperatures and ensuring that every area of the space receives adequate airflow.

While air filters are often located within or alongside air handlers, their primary responsibility is to clean the air, rather than being a function of the handler itself. Similarly, extracting heat or removing humidity can be functions carried out by other components in the HVAC system, such as heat pumps or dehumidifiers, but are not intrinsic to the role of the air handler. The main purpose remains firmly rooted in air circulation, making it a vital component for effective HVAC operation and overall comfort in a residential or light commercial setting.