The answer to 'difference between air duct sealing and' is that air duct sealing and duct insulation are two distinct HVAC services that serve different purposes. Air duct sealing is the process of identifying and patching any leaks or cracks in the ductwork to improve the efficiency of the HVAC system. Duct insulation, on the other hand, is the installation of insulating material around the ductwork to reduce heat transfer and maintain the desired temperature of the conditioned air as it travels through the ducts.
Air duct sealing is typically more cost-effective and can provide immediate energy savings by reducing the amount of conditioned air that is lost through leaks. Duct insulation, while more expensive, can provide long-term benefits by preventing heat gain or loss and further improving the overall efficiency of the HVAC system.