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How Old Is My Trane Air Conditioner or Furnace?

Your Trane 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 Trane 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 Trane serial number

Format: Three eras: YYWW, digit+WW, letter+WW

1. 2010+: first two digits = year, next two = week. 1623 = week 23 of 2016.
2. 2002–2009: first digit = year (2–9), next two = week. 752 = week 52 of 2007.
3. 1983–2001: first letter = year code, next two = week.

American Standard uses the identical formats.

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 Trane AC or heat pump was manufactured before 2010, it likely runs phased-out R-22 refrigerant.

Frequently asked questions