The answer to 'how much does air duct sealing cost' is that the cost can vary significantly depending on several factors. In general, air duct sealing typically ranges from $500 to $2,000 for an average-sized home. The exact cost will depend on the size and complexity of your ductwork, the materials and methods used, and your location.
Some key factors that influence the cost of air duct sealing include the accessibility of the ductwork, the amount of sealing required, whether any ductwork repairs are needed, and the experience and labor rates of the HVAC contractor. Getting multiple quotes from local HVAC professionals is essential to understanding the typical costs in your area.