The answer to 'how long does air duct cleaning cleaning last' is that the duration of air duct cleaning can vary, but typically it lasts between 1-3 years before needing to be done again. The lifespan of air duct cleaning depends on factors like the size of your home, the number of occupants, and how much dust and debris accumulates in the ducts over time.
For most average-sized homes with 2-4 occupants, air duct cleaning is recommended every 1-3 years to maintain good indoor air quality and HVAC system efficiency. Homes with more occupants, pets, or that are in dusty environments may need more frequent cleanings, like every 1-2 years. Regular air duct cleaning helps remove allergens, improve airflow, and extend the life of your HVAC system.