The answer to 'air duct dirty' is that dirty air ducts are a common problem in many homes. This can be caused by a buildup of dust, debris, pet hair, and other contaminants over time. Symptoms of dirty air ducts include reduced airflow, increased dust and allergens in the home, and higher energy bills due to the HVAC system working harder.
In most cases, homeowners should call a professional air duct cleaning service to properly clean and maintain their ductwork. DIY duct cleaning is possible but can be challenging and may not be as effective. Professionals have the right equipment and expertise to thoroughly clean the entire duct system and ensure it is working efficiently.