The answer to 'average cost for air duct sealing' is that the typical range can vary widely, but most homeowners can expect to pay between $500 to $2,000 for professional air duct sealing. The exact cost will depend on factors like the size and accessibility of your ductwork, the materials used, and the complexity of the job.
Proper duct sealing is important to improve your HVAC system's efficiency and indoor air quality. It involves using mastic sealant or specialized tapes to close any gaps or leaks in the ductwork. While you can attempt DIY duct sealing, it's generally recommended to hire a licensed HVAC technician to ensure the job is done correctly.