There are many ways to combat poor IAQ with the help of an HVAC system, whether it be an air conditioning, heating, or ventilation system. The most common methods to improve the IAQ in your home are: Ventilation - helps air out the home and brings in fresh air from the outdoors. Filtration - circulates the air in the home and filters out particles UV purification - kills microorganisms HVAC system cleaning - keeps your system running clean and efficiently. Source control - remove or replace poor IAQ sources such as candles and cleaning supplies Humidity control - control humidity levels within recommended guidelines. Reactive defense systems - explore supplementary IAQ solutions. You can consult with an IAQ specialist, such as an HVAC Pro, to further discuss how to improve the IAQ in your home.