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How Old Is My York Air Conditioner or Furnace?

Your York unit's age is encoded in its serial number. Here is exactly how to decode it or use our free tool.

Where to find the York serial number

On an air conditioner or heat pump, look for the data plate on the side or rear of the outdoor unit. On a furnace, open the upper front door — the plate is inside the cabinet.

How to decode a York serial number

Format: Plant+year+month+decade (2005+)

1. Char 1 = plant letter (ignore for dating).
2. Char 2 = last digit of the year.
3. Char 3 = month letter: A–M skipping I.
4. Char 4 = decade digit. Combine decade + year digit.

Coleman and Luxaire use the identical format.

What your unit's age means

Typical lifespan for residential HVAC is 15–20 years. Under 10 years: repair with an OEM part. 10–15 years: repairs usually still win. Past 15 years: compare repair vs replacement.

R-22 warning: if your York AC or heat pump was manufactured before 2010, it likely runs phased-out R-22 refrigerant.

Frequently asked questions