The answer to 'how often to replace air duct sealing' is that most experts recommend replacing air duct sealing every 5-10 years, depending on the condition of the seals. Proper sealing of air ducts is essential for maintaining efficient HVAC performance and preventing air leaks that can waste energy and increase utility costs.
Over time, the caulk, mastic, or other sealants used to close gaps and joints in air ducts can crack, dry out, and become less effective. This allows conditioned air to escape, reducing the HVAC system's efficiency. Regularly inspecting and replacing the air duct sealing can help ensure your home's HVAC system operates at peak performance.