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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.
Current air conditioning standards are the result of research from 1960s. It used standard âmetabolic rateâ to work out a comfortable temperature. Now, researchers say that women do indeed prefer warmer temperatures. They favour a room of 25C (77F) compared with 22C (72F) for men.