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How old is my Comfort-Aire air conditioner?

Serial number age decoder for Comfort-Aire central air conditioners: 6 format eras, the decode rule in plain English, transcribed tables, and the official lookup.

Serial number decoder for Comfort-Aire air conditioner

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

Format example: RSF150300183

Format eras

How to read the serial

1995 to 2004 formatPARTIAL

Shape ##A-A##### · example 92A-C70097 · confidence low

Year
digits 1-2 (YY) -> 1992
Week or month
month = letter 3 (A=Jan..M=Dec, I skipped) -> Jan
Documented but not evaluated by the decoder: example 92A-C70097 does not decode with the derived engine.
Trap: Addison Products (APCO) style, used while Heat Controller owned Addison (~1995-2004; the example 92 predates that window - building-center's own note). Sequence after the hyphen may start with a letter.

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 AA#A###A######### · example EB5D302F320107830 · confidence medium

Year
digits 11-12 (YY) -> 2010
Week or month
week = digits 9-10 -> week 32
Plant
letters in positions 1-8 per Rheem scheme

Example: serial EB5D302F320107830 decodes to week 32 of 2001.

Trap: Rheem-built. Same as Rheem HVAC 17-char style (see Rheem rules).

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.

era not stated formatUNSOURCED

Shape AA########A · example JR10006245X · confidence low

Documented but not evaluated by the decoder: no year decode text.
Trap: Unknown PRC manufacturer ('Made in PRC', R22 units, est. late 1990s-early 2000s); building-center suspects the 2 leading letters encode the date. Undecoded.

Where the data plate is on an air conditioner

On the outdoor condenser: a metal or foil plate on the side or back of the cabinet, often near the refrigerant line connections. Some brands repeat it inside the electrical access panel.

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 Air Conditioner (central) at 7 to 15 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

Sources

Comfort-Aire heat pump Comfort-Aire furnace All central air conditioner brands Guides