The answer to 'how much does air duct sealing cost in my area' is that the cost can vary widely depending on several factors. In general, air duct sealing typically ranges from a few hundred dollars to a few thousand dollars for an average-sized home. The exact cost will depend on the size of your home, the accessibility and condition of your ductwork, the materials and sealants used, and the labor required by the HVAC contractor.
It's important to get multiple quotes from reputable HVAC companies in your local area, as pricing can vary significantly between providers. Be sure to ask about any discounts or financing options that may be available as well.