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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.
Just because the air conditioner itself will last 20 years, this doesn't mean that all the parts will last this long. Evaporation coils, scroll compressors, and air handlers can go out much earlier. As long as this is caught in time, these parts can be replaced without having to replace the entire unit.With average use these parts will last the majority of the life of the unit itself. If your air conditioner is more than 20 years old, you may want to consider replacing the unit.s long as this is caught in time, these parts can be replaced without having to replace the entire unit. With average use these parts will last the majority of the life of the unit itself. If your air conditioner is more than 20 years old, you may want to consider replacing the unit.