What is the primary function of an air filter in an HVAC system?

The primary function of an air filter in an HVAC system is to remove dust and allergens from the air. Air filters are designed to trap particles such as dust, pollen, pet dander, and other allergens that can circulate in the indoor environment. By doing this, they improve indoor air quality, making the air cleaner and healthier for occupants. This is especially important for individuals with respiratory issues or allergies, as a clean air supply can significantly reduce their symptoms.

The removal of these particulates not only benefits occupants’ health but also helps protect the HVAC system itself. Clean filters can improve the efficiency of the system, reduce energy consumption, and prevent dust buildup within the equipment, which can lead to mechanical issues over time.

The other options involve functions that are not directly tied to the purpose of air filters. Cooling air relates more to the air conditioning coils, regulating humidity pertains to dehumidifiers or humidistats, and circulating refrigerant is the role of the compressor and associated components in the system. Thus, these choices do not align with the primary responsibility of an air filter in an HVAC system.