Air ducts typically do not need to be replaced unless they are damaged, leaking, or have reached the end of their lifespan. The lifespan of air ducts ,depends on a variety of factors, such as the quality of the materials used, the installation process, and the level of maintenance they receive.

In general, well-installed and maintained air ducts can last anywhere from 10 to 25 years. However, if your ducts are damaged or leaking, they may need to be replaced sooner to avoid compromising your HVAC system’s efficiency and air quality. Additionally, if you notice that your HVAC system is not performing as well as it used to or you have significant air quality issues, it may be time to have your air ducts inspected by a professional to determine if replacement is necessary.

Ultimately, the frequency with which you need to replace your air ducts will depend on your specific circumstances. It’s best to have your ducts inspected regularly by a professional HVAC technician who can provide guidance on maintenance and replacement schedules based on your system’s needs.