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Telltale Clues to Your Air Conditionerâs Life Span. 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.
If your air conditioner is between 10-15 years old, it may be more cost efficient to replace the unit, especially if your unit is no longer under warranty. If your unit is in need of frequent repairs, the repairs may end up costing you more than a new unit in the long run.he cost of air conditioning replacement has many variants, including: 1  The size of your home. 2  The age of your home. 3  What type of unit you choose to install. 4  If your house needs new or replacement ductwork. 5  Etc.