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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.
Measuring Cooling Capacity. The cooling capacity of an air conditioner is measured in tons. In regards to cooling, 1 ton is equal to 12,000 BTU's (British Thermal Units). A standard air conditioner ranges in size, from smallest to largest:1  18 = 1.5 Ton (18,000 BTU). 2  24 = 2.0 Ton (24,000 BTU). 3  30 = 2.5 Ton (30,000 BTU).easuring Cooling Capacity. The cooling capacity of an air conditioner is measured in tons. In regards to cooling, 1 ton is equal to 12,000 BTU's (British Thermal Units). A standard air conditioner ranges in size, from smallest to largest: 1  18 = 1.5 Ton (18,000 BTU). 2  24 = 2.0 Ton (24,000 BTU).