Furnaces & AC / Payne

How old is my Payne 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

Payne serial formats we can read

Dark = year, orange = month or week.

Week + year + factory

4006A17330

Week 40, 2006 (around October).

Coverage and sources

Supports the 10-character, four-digits + letter + five-digits layout used since 1980. Earlier layouts are excluded. The indoor and outdoor units can have different manufacture dates.

References checked 2026-10-26.

Independent reference tool, unaffiliated with Payne. Sources & method