How old is my Carrier air conditioner?
Serial number age decoder for Carrier central air conditioners: 4 format eras, the decode rule in plain English, transcribed tables, and the official lookup.
Type the serial from the data plate, not the model number. Nothing is sent anywhere; the tables are in this page.
Format example: 4006A17330
- Carrier air conditioner 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.
- Carrier air conditioner serial numbers in the 1980 to 1989 format encode the year as digits 1-2 and the month as digits 3-4 (source: building-center.org).
- Example: serial 850304091 decodes to March 1985.
- Carrier air conditioner serial numbers in the 1969 to 1979 format encode the year as digit 2 = last digit of year (1969-1979) and the month as letter 1 (A=Jan..L=Dec) (source: building-center.org).
- Example: serial A167890 decodes to January 1971.
- Carrier's official lookup at carrier.com returns current coverage status.
Format eras
- 1980 to present VERIFIED
####A#####digits 3-4 (2-digit year; century by context, 1980+) - 1980 to 1989 VERIFIED
#########digits 1-2 - 1969 to 1979 VERIFIED
A######digit 2 = last digit of year (1969-1979) - 1960 to 1979 VERIFIED
##A######first LETTER via table (L=1960 .. H=1979, cycles L-Z then A-H, skipping O, Q, Z)
How to read the serial
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.
1980 to 1989 formatVERIFIED
Shape ######### · example 850304091 · confidence medium
- Year
- digits 1-2
- Week or month
- month = digits 3-4
Example: serial 850304091 decodes to March 1985.
1969 to 1979 formatVERIFIED
Shape A###### · example A167890 · confidence medium
- Year
- digit 2 = last digit of year (1969-1979)
- Week or month
- month = letter 1 (A=Jan..L=Dec)
| Month code | Month |
|---|---|
| A | January |
| B | February |
| C | March |
| D | April |
| E | May |
| F | June |
| G | July |
| H | August |
| I | September |
| J | October |
| K | November |
| L | December |
Example: serial A167890 decodes to January 1971.
1960 to 1979 formatVERIFIED
Shape ##A###### · example 46U152456 · confidence high
- Year
- first LETTER via table (L=1960 .. H=1979, cycles L-Z then A-H, skipping O, Q, Z)
- Week or month
- week = leading 1-2 digits (1-52)
| Year code | Year(s) |
|---|---|
| L | 1960 |
| M | 1961 |
| N | 1962 |
| P | 1963 |
| R | 1964 |
| S | 1965 |
| T | 1966 |
| U | 1967 |
| V | 1968 |
| W | 1969 |
| X | 1970 |
| Y | 1971 |
| A | 1972 |
| B | 1973 |
| C | 1974 |
| D | 1975 |
| E | 1976 |
| F | 1977 |
| G | 1978 |
| H | 1979 |
Example: serial 46U152456 decodes to week 46 of 1967.
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.
Open the official Carrier lookup takes serial number; returns current coverage status; URL verified live
This site is a reference built from published tables. The manufacturer's own lookup wins whenever the two disagree.
Sources
- https://www.building-center.org/carrier/
- https://www.building-center.org/bryant-hvac-age/
- https://www.carrier.com/residential/en/us/warranty-lookup/official
Frequently asked questions
How do I tell the age of a Carrier air conditioner from the serial number?
In the 1980 to present format the year is digits 3-4 (2-digit year; century by context, 1980+) and the week as digits 1-2 (01-53). Example: serial 4006A17330 decodes to week 40 of 2006.
Where is the serial number on a Carrier air conditioner?
On the data plate. 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.