The answer to 'air duct dusty' is that dusty air ducts are a common problem in many homes. This can be caused by a buildup of dust, dirt, and other debris in the ductwork, which can reduce air flow and indoor air quality. Symptoms may include increased dust and allergens in the home, as well as reduced HVAC efficiency.
The best solution is to have your air ducts professionally cleaned every 3-5 years, or more frequently if you have pets, smoke indoors, or notice a significant dust buildup. DIY duct cleaning is not recommended, as it can be difficult to access all areas of the ductwork and may cause more harm than good. It's best to hire a licensed HVAC technician who has the proper equipment and expertise to thoroughly clean your air ducts.