The integrity of the duct system directly impacts the performance of the gas furnace & air conditioning. The branching network of ducts transfers heated & cooled air to & from the rooms of the house. Even minor holes or flaws in the ducts allows conditioned air to escape. It makes it way more difficult for the gas furnace or air conditioning to achieve the temperature setting on the control unit. Leaks in the ductwork forces the heating & cooling system to run for longer cycles & results in far greater wear & tear. More frequent malfunction, higher utility bills, & shortened repair life are some of the consequences. These same holes in the duct system also allow outside, dirty, unconditioned air into the home. Dust, exhaust fumes, bugs, & all sorts of pollutants can be introduced into the indoor environment, creating a safety & health issue. It is a great system to have the duct system checked by a licensed Heating & A/C business every couple of years. An Heating & A/C serviceman has the tools to effectively test the duct system for flaws & handle the sealing process. While duct sealing is rather costly, it pays for itself through weekly energy savings. The serviceman will first seal off the supply & return vents, before injecting pressurized air into the duct system. The pressurized air contains adhesive particles which attempt to escape through the holes. As the air passes through, the particles build up & gradually seal the many leaks & flaws. The Heating & A/C serviceman will repeat testing to ensure that the duct system is effectively sealed & give a computer generated report of the findings.