Furnaces & AC / Trane

How old is my Trane HVAC unit?

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Where to find the serial number

Rating label on the outdoor AC cabinet
Close-up of a rating label showing the serial numberLook for “Serial” or “S/N” near the service connections

Trane serial formats we can read

Dark = year, orange = month or week.

2010 onward year/week

10161KEDAA

Week 16, 2010 (around April).

2002–2009 single-digit year/week

91531S41F

Week 15, 2009 (around April).

Coverage and sources

Supports the displayed 2002–2009 and 2010 onward layouts. The printed MFR date takes priority. Earlier lookalike commercial serials and letter-year layouts are excluded.

References checked 2026-10-26.

Independent reference tool, unaffiliated with Trane. Sources & method