The answer to 'how long will air duct sealing last' is that properly applied air duct sealing can last 10-15 years or more. High-quality duct sealants and tapes are designed to withstand the temperature changes, vibration, and airflow in HVAC ductwork, providing a long-lasting seal that helps improve energy efficiency and indoor air quality.
The lifespan of air duct sealing depends on factors like the quality of the materials used, proper installation techniques, and the overall condition of the ductwork. Regular maintenance and inspections can also help extend the useful life of duct sealing. If you notice any cracks, gaps, or deterioration in your ductwork, it's a good idea to have a professional HVAC technician evaluate and reseal the ducts as needed.