Heating and cooling systems incorporate an air filter to clean incoming air before it is conditioned and distributed throughout the home. In many HVAC systems, the air cleaner has two different functions. The first is to protect the HVAC system. Dust and other particles can easily cause component wear and can stick to parts such as the fan or evaporator, reducing system efficiency.
The second job is to remove dust, pollen, pet dander and other pollutants from the air, which improves indoor air quality and can reduce symptoms of conditions such as asthma and allergies. Some air filters are primarily designed to protect the HVAC system, while others can protect the system and improve air quality.