The air filters of your HVAC system are there to provide clean air that is circulated throughout the home via airflow channels. If you fail to change air filters on time, it may result in the buildup of a wide range of contaminants like pollen, dust and dirt. Changing air flirters on time will prevent sudden breakdown of your unit and also keep it maintained. All this will also help in minimizing the odours from your system in the building.