What is the purpose of a drain pan in HVAC systems?

The purpose of a drain pan in HVAC systems primarily revolves around its role in managing condensate. During the cooling process, moisture from the air condenses and drips off the evaporator coil. The drain pan is designed to collect this condensate, preventing it from leaking into the surrounding areas, which could cause significant water damage. By directing the condensate towards a drain line, it ensures that excess moisture is safely removed from the system, thereby protecting the integrity of the HVAC unit and the building structure. This function is crucial for maintaining a safe and efficient environment, as standing water can lead to mold growth and structural degradation.

The other choices do not align with the primary functions of a drain pan. Enhancing airflow or filtering dust are functions of different components in the HVAC system, while the housing of the compressor unit pertains to its location rather than the function of collecting moisture.