How old is my Comfort-Aire furnace?

Serial number age decoder for Comfort-Aire furnaces: 3 format eras, the decode rule in plain English, transcribed tables, and the official lookup.

Serial number decoder for Comfort-Aire furnace

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: RSF150300183

Comfort-Aire furnace serial numbers in the era not stated format encode the year as digits 4-5 (YY) -> 2015 and the month as digits 6-7 -> Mar (source: building-center.org).
Example: serial RSF150300183 decodes to March 2015.
Comfort-Aire furnace serial numbers in the era not stated format encode the year as digits 1-2 (YY) -> 2008 and the month as digits 3-4 -> Apr (source: building-center.org).
Example: serial 0804237539 decodes to April 2008.
Comfort-Aire furnace serial numbers in the era not stated format encode the year as digits 2-3 (YY) -> 2004 and the week as digits 4-5 -> week 24 (source: building-center.org).
Example: serial R0424070098 decodes to week 24 of 2004.

Format eras

era not stated VERIFIED
AAA#########digits 4-5 (YY) -> 2015
era not stated VERIFIED
##########digits 1-2 (YY) -> 2008
era not stated VERIFIED
A##########digits 2-3 (YY) -> 2004

How to read the serial

era not stated formatVERIFIED

Shape AAA######### · example RSF150300183 · confidence medium

Year: digits 4-5 (YY) -> 2015
Week or month: month = digits 6-7 -> Mar
Plant: leading 3 letters = product series (mirrors model prefix)

Example: serial RSF150300183 decodes to March 2015.

Trap: Nordyne-built units (most recent Comfort-Aire). Same as Nordyne style.

era not stated formatVERIFIED

Shape ########## · example 0804237539 · confidence medium

Year: digits 1-2 (YY) -> 2008
Week or month: month = digits 3-4 -> Apr

Example: serial 0804237539 decodes to April 2008.

Trap: Goodman-built. Same as Goodman style.

era not stated formatVERIFIED

Shape A########## · example R0424070098 · confidence medium

Year: digits 2-3 (YY) -> 2004
Week or month: week = digits 4-5 -> week 24
Plant: leading letter = ICP plant code

Example: serial R0424070098 decodes to week 24 of 2004.

Trap: ICP/Carrier-built. Same as the ICP letter-prefixed style.

Where the data plate is on a furnace

Inside the furnace: remove the upper (burner) access door and look on the inside of the door, on the blower compartment wall, or on a sticker facing you at the burner deck.

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

For scale only: the InterNACHI Standard Estimated Life Expectancy Chart for Homes lists Furnace at 15 to 25 years of expected service (nachi.org). That chart is a guideline, not a prediction for your unit.

Official lookup

No online serial lookup was found for Comfort-Aire in our research. The manufacturer's customer service line, the installer's invoice, or a printed date on the plate are the remaining authorities.

What we could not confirm

No official online lookup URL was verified for Comfort-Aire.
Private label - serials follow whichever OEM built the unit (Nordyne, Rheem, Goodman, ICP/Carrier, Addison/APCO, ClimateMaster, unknown PRC maker). Plates do not name the OEM, so a decoder must try the OEM patterns. marsdelivers.com redirects to rectorseal.com/mars-lp (no warranty lookup); shop.heatcontroller.com = 200 (parts store only). No lookup URL.

Sources

https://www.building-center.org/comfort-aire-hvac-age/
img: Comfort-Aire-style-1.jpg
img: Comfort-Aire-style-3.jpg
img: Comfort-Aire-style-4.jpg