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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.
Make Sure a New System Is Sized Right. If you decide to replace, make sure the contractorâs bid includes a load calculation, which is a computer printout showing how big a system you need and why. Air conditioning is measured by the ton, which is the cooling power of a one-ton block of ice melting in 24 hours. Some old-school installers use a ballpark estimate for sizing equipmentâsay, one ton for every 400 or 600 square feet of living space.