The answer to 'how often to clean air duct cleaning' is that most experts recommend having your air ducts professionally cleaned every 3-5 years. This helps maintain good indoor air quality and improve the efficiency of your HVAC system. Proper air duct cleaning can remove built-up dust, debris, and even mold or mildew that can accumulate over time.
However, the exact frequency may vary depending on factors like the size of your home, the number of occupants, and whether you have pets or smokers in the home. Homes with more occupants or pets may need more frequent cleanings, such as every 2-3 years. It's also a good idea to have your air ducts cleaned if you notice any significant dust buildup or a decline in HVAC performance.