I handle the temperature control of my lake lake house with a forced air heating and cooling system. Both the furnace and undefined utilize a duct system. The ductwork is concealed in the walls, ceilings, and basement, and is linked to supply and return vents in every room of the house. The heated and cooled air passes through this complex network of pipes more than 2 times per day. The more than 2 sections of ductwork are connected together by sheet-metal screws, and the seams are then further sealed with mastic. Over years of usage and possible corrosion, most residential duct systems leak at the seams and develop small holes which waste energy and lead to room-to room pressure imbalances. Even minor flaws in the duct system result in major concerns with furnace and undefined performance. Higher running costs, longer cycles, more frequent repairs and premature equipment failure are some of the consequences. Leaks in the duct system can often be blamed for hot/chilly spots in the house, drafts, excess humidity, unpleasant aromas and bad indoor air conditions. It is a fantastic method to hire a certified Heating, Ventilation as well as A/C dealer to inspect the duct system every few years. The sealing process is not overly involved, and causes no mess or destruction to the home. The Heating, Ventilation as well as A/C dealer covers all supply and return vents before blowing a steady stream of air into the duct system. The air contains adhesive polymer particles and is put under extreme pressure. As the air escapes through holes in the ducts, the particles stick to the edges, build up and create a slender seal.