Air handlers have a life expectancy of between 15 and 25 years, which is roughly the same length of time as most other pieces of an HVAC system. Of course, there are many outside factors that will affect this length of time. How well maintenance is done on air handlers and other equipment will have a significant impact on how long your air handler will last before needing replacement. Air handler repairs are important as well in keeping your air handler unit operating for as long as possible.