In the 1970s, central air conditioning systems became so popular that most newly-constructed houses started to be built with ductwork. The reason for the popularity is that it is a good system, and people really enjoy all the benefits of it. However, no system works forever with no issues. Ductwork can develop problems, often with age but sometimes due to specific damage in relatively-new ductwork. With ducts usually tucked away out of sight, how can you tell if there are problems? Keep an eye out for these signs that you need duct repair.