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How old is my Comfortmaker packaged unit?

Serial number age decoder for Comfortmaker packaged rooftop and ground units: 2 format eras, the decode rule in plain English, transcribed tables, and the official lookup.

Serial number decoder for Comfortmaker packaged unit

Serial no.

Type the serial from the data plate, not the model number. Nothing is sent anywhere; the tables are in this page.

Format example: 4006A17330

Comfortmaker packaged unit serial numbers in the 1980 to present format encode the year as digits 3-4 (2-digit year; century by context, 1980+) and the week as digits 1-2 (01-53) (source: building-center.org).
Example: serial 4006A17330 decodes to week 40 of 2006.
Comfortmaker's official lookup at comfortmaker.com returns warranty / registration lookup.

Format eras

before 1991 VERIFIED
##########-A##-####NOT encoded in the serial; read the separate 'MFG Date M-YY' printed on the plate (sample
1980 to present VERIFIED
####A#####digits 3-4 (2-digit year; century by context, 1980+)

How to read the serial

before 1991 formatVERIFIED

Shape ##########-A##-#### · example 0000211401-P36-0098 · confidence medium

Year: NOT encoded in the serial; read the separate 'MFG Date M-YY' printed on the plate (sample plate: MFG Date 9-87)

Documented but not evaluated by the decoder: year position not parseable from prose: "NOT encoded in the serial; read the separate 'MFG Date M-YY' printed on the plat".

Trap: Snyder General era (Snyder General sold Arcoaire and Comfortmaker to ICP in 1991). Serial carries no date.

1980 to present formatVERIFIED

Shape ####A##### · example 4006A17330 · confidence high

Year: digits 3-4 (2-digit year; century by context, 1980+)
Week or month: week = digits 1-2 (01-53)
Plant: letter at position 5 (plant/line code; table not published)

Example: serial 4006A17330 decodes to week 40 of 2006.

Trap: Same 4-digit-letter-5-digit shape as Lennox style 1 (Lennox = plant,plant,YY,month-letter). Two-digit year needs century disambiguation (e.g. 06 = 2006 vs 1986); use ANSI/date on plate.

Listed under Carrier in the source; Comfortmaker is named in that format's family.

Where the data plate is on a packaged unit

On the cabinet exterior near the electrical access panel, or inside the panel door.

General guidance, not brand-specific: the owner's manual or the installer can point to the exact spot. See the data plate guide.

Official lookup: the authority

Open the official Comfortmaker lookup takes serial number; returns warranty / registration lookup; URL verified live

This site is a reference built from published tables. The manufacturer's own lookup wins whenever the two disagree.

What we could not confirm

The before 1991 format is documented but not decodable here: year position not parseable from prose: "NOT encoded in the serial; read the separate 'MFG Date M-YY' printed on the plat".
ICP brand since 1991 (bought from Snyder General). Styles: E072514528, R921500600 (R prefix), and the Snyder General 0000211401-P36-0098 style with a separate printed MFG Date.