The answer to 'how long does air duct cleaning last' is that the duration of air duct cleaning effectiveness can vary, but typically lasts 3-5 years. Professional air duct cleaning removes built-up dust, debris, and contaminants from the ductwork in your home, improving indoor air quality and the efficiency of your HVAC system. However, over time, new dust and allergens can accumulate, so it's recommended to have your air ducts professionally cleaned every 3-5 years.
The longevity of air duct cleaning depends on factors like the size of your home, how many occupants live there, whether you have pets, and how often the HVAC system is used. Homes with more occupants, pets, or heavy HVAC usage may need more frequent cleanings to maintain optimal air quality and system efficiency.