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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 mean age of air, denoted , is obtained by solving the following advection equation: The derivative with respect of time of the source is 1 so that the integral itself is time. When integrated, the age scalar will equal the residence time.