How does an air handler work within an HVAC system?

An air handler is a crucial component in an HVAC system that works by circulating and conditioning the air to ensure optimal indoor air quality and comfort. It serves multiple functions, primarily including the distribution of air throughout the space, which involves drawing in air from the environment, filtering it to remove impurities, and then either heating or cooling it as necessary before distributing it via ductwork to occupied areas.

The conditioning aspect refers to the adjustment of temperature and, sometimes, humidity levels. In cooling mode, the air handler works alongside the air conditioning system, where it blows air over the chilled coils to lower the air temperature. Conversely, when providing heat, it may blow air over warm coils or use a heat exchanger to raise the air temperature.

By executing these functions, the air handler helps maintain a comfortable and healthy indoor environment, making its role integral to the overall operation of an HVAC system.