The ducts have a maximum lifespan of 20 to 25 years. However, at the age of 15, it begins to deteriorate, which significantly reduces the efficiency of the air conditioning system, so the most prudent option is to replace them. The ducts are designed to last between 10 and 15 years on average. They are made from a combination of materials such as fiberglass and plastic.
Even if your air conditioning system works well, if the ducts are not maintained, the results can be poor air quality and lower efficiency. An essential part of routine maintenance of your HVAC system includes ensuring that ductwork is clean and free of damage. So when your ductwork isn't properly maintained, you could end up needing duct repair and replacement. The NADCA also recommends replacing ducts every 10 to 15 years.
Extenuating circumstances could shorten that lifespan and require an earlier replacement. That's why it's so important to hire the right commercial HVAC maintenance company to ensure that the key components of your HVAC system are not neglected.