Sealing HVAC ducts is a crucial task for improving energy efficiency and indoor comfort. While some DIY duct sealing products are available, sealing ducts can be a challenging and labor-intensive process. Properly sealing ducts requires identifying leaks and using appropriate sealing materials. For optimal results and to ensure all leaks are sealed correctly, it's best to hire a professional HVAC technician. They have the expertise, tools, and experience to perform duct sealing effectively, improving the system's efficiency and reducing energy wastage.