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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 lifespan for an air conditioner is 10 to 15 years. Some air conditioners last up to 20 years. As interesting as these data points may be, they don't tell you the whole story. The issue is that a variety of factors affect the lifespan of an air conditioner.When you buy a new A/C unit, you may be given a rough estimate about how long it will last.ow to Make Your Air Conditioner Last Longer. Air conditioners last longer when homeowners are conscientious about taking care of them. Unfortunately, many people do little more than switch them on at the beginning of the summer and switch them off at the onset of winter.