Any discussion about how long do AC units last should include the question: when is its useful life officially over? Like your family car, HVAC systems will need some TLC – regular tune-ups and minor repairs and parts replacement. One homeowner might think that the first time a unit quits running and is no longer under warranty, it’s time for a new one. Another might consider making a number of repairs, even at great expense, to keep an existing system running. So the repair or replacement issue plays a role in determining the life of the AC unit.

Beyond that, factors that play into the lifespan of air conditioners include:

  • Installation quality and proper sizing
  • Personal comfort preferences, thermostat settings, and system wear and tear
  • Climate issues such as high humidity
  • Air quality issues such as salty sea air or other airborne corrosives
  • Regular maintenance