The answer to 'which is better air duct sealing or' is that air duct sealing is generally better than alternative duct repair methods. Air duct sealing is a cost-effective way to improve the efficiency of your HVAC system and reduce energy costs. It involves using mastic or foil-backed tape to seal any leaks or gaps in your ductwork, preventing conditioned air from escaping.
Compared to other duct repair options like duct replacement or duct lining, air duct sealing is more affordable and can be done without major disruption to your home. It's also a more effective solution for improving indoor air quality and comfort levels. By sealing leaks, you can prevent dust, pollen, and other contaminants from entering your living space through the ductwork.