It is really easy to neglect the duct system. However, any problems with the ducts affects comfort and air quality and typically results in higher energy bills. A common issue is a duct system that is improperly designed and installed. The system needs to facilitate airflow and minimize strain on the furnace and air conditioner. If the pipes are too big, too small or include sharp bends, airflow is restricted. Flexible plastic air ducts have become more common. This type of ductwork can become kinked, crushed, torn or twisted, forcing the heating and cooling system to work much harder and resulting in wear and tear. There’s also the concern over leaking ductwork. The average home sacrifices approximately twenty to forty percent of the heated/cooled air that circulates through the ducts. If registers are not sealed effectively at the duct connection or if there are holes in the ducts or leaks at the seams, air can escape. When conditioned air doesn’t reach the intended destination, the various rooms feel either chilly or overheated. You’re likely to adjust the thermostat, putting more strain on heating and cooling equipment and ending up with higher monthly bills. Ducts that are not insulated all for loss of heated air during the winter and cooled air in the summer. This problem is worsened when ducts are located in non-conditioned spaces, such as the attic. If the duct system has not been cleaned for some time, there is most likely a buildup of contaminants hidden inside. Allergens such as dust, pollen, mold, bacteria, bugs and even decomposing rodents can be concealed within the ducts and lead to all sorts of health concerns. Every time the air passes through the ducts, it picks up these pollutants, spreads them throughout the house and degrades indoor air quality.