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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.
5 Tips for Buying Central Air Conditioning. A homeowner replaced the HVAC equipment in his home with this high-efficiency, 16-SEER system. (Photo courtesy of Angie's List member Thomas R. of San Diego) A/C systems last between 10 and 20 years, so you'll probably buy a new one at some point. The air conditioner plays an important role in the home, helping to circulate cool air, reduce humidity and maximize comfort. A typical central A/C system can last anywhere from 10 to 20 years, so most homeowners will have to purchase a new system at some point in their lives.