Dirty filters are a common cause of HVAC related issues. Your filter keeps the air in your home clean and keeps all that dirt out of your furnace and air conditioning system. Dirt accumulation on your A/C coil can lead to low or no airflow, furnace trouble, Coil freezing, heat exchanger failure, and A/C compressor damage. The compressor is the heart of the cooling system, and they can be one of the costliest items to replace. A little bit of maintenance on your part can save a lot of headaches down the road.