A dirty filter in your HVAC system will raise your energy bills. A dirty filters restricts the air flow into your HVAC systems air handler, causing in to work harder to cool or heat your home.
Regularly replacing your air filter will help improve the efficiency and longevity of your furnace.
A dirty clogged filter can restrict HVAC airflow and potentially cause problems with the system. They also cease to filter allergens and other particulars out your air.