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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 standards do not require you to change your existing central air conditioning units, and replacement parts and services should still be available for your home's systems. The lifespan of a central air conditioner is about 15 to 20 years.