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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.
1 Longer AC lifespan. 2  The average lifespan of an air conditioner is from 10 to 20 years, but some can last up to 30 years. 3  How long your system lasts will depend on how well it's maintained. 4  Cooling systems that receive little or no care may not even last for 10 years.he HVAC contractors at Air Conditioning South East recommend preventive maintenance every spring, just before the warm weather begins. Your system works 24/7 to keep you cool, and it needs regular care to perform properly.