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Telltale Clues to Your Air Conditionerâs Life Span. 1  The A/Câs age â The average air conditioner life span is roughly 15 years. If yours is over 10 years old, you can expect to see a steady loss of cooling capacity and efficiency. Older equipment is more prone to breakdowns too, so necessary repairs are more frequent.
The Average Air Conditioner Lifespan. The average air conditioner lifespan is around 15-20 years, according to the U.S. Department of Energy. While there is no way you can guarantee that your unit will last forever, there ARE a number of things that you can do to make sure it lasts as long as possible.1  Keep up on maintenance.he average air conditioner lifespan is around 15-20 years, according to the U.S. Department of Energy. While there is no way you can guarantee that your unit will last forever, there ARE a number of things that you can do to make sure it lasts as long as possible.