Increase HVAC efficiency with duct insulation wrap. Modern heating and cooling systems are designed for maximum energy efficiency, but the duct work that transports the hot or cool air has not been updated for years. Metal ducts provide no insulation value for conditioned air between your HVAC system and the room that it empties into. As air travels from the HVAC unit through the ducts some of it escapes through poorly sealed joints. Secondly, the conditioned air begins to lose its temperature - especially on longer duct runs. The result of these situations is lowered HVAC efficiency and higher utility bills. Insulating duct work with reflective bubble insulation increases the efficiency of your HVAC system. EcoFoil R8 Duct Insulation Wrap provides an R-8 Value by reflecting radiant and convective heat. Make sure to use HVAC tape around duct seams to prevent leaks.