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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.
Noisy equipment, excessive humidity within the home and a unit older than 10 years are among the top reasons to replace your central air conditioning, according to Energy Star, a U.S. government program promoting energy efficiency.or example, at the time of publication, the Central Air Conditioning Prices website rates a 1.5-ton, 18,000 Btu air conditioning unit and coil at $710, while a 5-ton, 60,000 Btu unit and coil is listed at $1,640, excluding installation.