How old is my Allied Air air conditioner?
Serial number age decoder for Allied Air 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: 5899L17212
- Allied Air air conditioner serial numbers in the 1973 to present format encode the year as digits 3-4 (YY) and the month as letter at position 5 (A=Jan .. M=Dec, I skipped) (source: building-center.org).
- Example: serial 5899L17212 decodes to November 1999.
- Allied Air air conditioner serial numbers in the era not stated format encode the year as digits 3-4 = YY (4601J19567 = 2001; 1606B13871 = 2006; 4607B20058 = 2007) and the month as letter 5 (A=Jan .. M=Dec, I not used) (source: building-center.org).
- Example: serial 4601J19567 decodes to September 2001.
- Allied Air air conditioner serial numbers in the era not stated format encode the year as digits 7-8 = YY (4140720328 = 2003; 0183290431 = 2004) and the week as digits 9-10 (28; 31 = end of August) (source: building-center.org).
- Example: serial 4140720328 decodes to week 28 of 2003.
Format eras
- 1973 to present VERIFIED
####A#####digits 3-4 (YY) - 1970 to 1977 VERIFIED
##A##AA###digits 4-5 = year REVERSED (67 = 1976) - era not stated VERIFIED
####A#####digits 3-4 = YY (4601J19567 = 2001; 1606B13871 = 2006; 4607B20058 = 2007) - era not stated VERIFIED
##########digits 7-8 = YY (4140720328 = 2003; 0183290431 = 2004)
How to read the serial
1973 to present formatVERIFIED
Shape ####A##### · example 5899L17212 · confidence high
- Year
- digits 3-4 (YY)
- Week or month
- month = letter at position 5 (A=Jan .. M=Dec, I skipped)
- Plant
- digits 1-2 = factory/plant code
| Month code | Month |
|---|---|
| A | January |
| B | February |
| C | March |
| D | April |
| E | May |
| F | June |
| G | July |
| H | August |
| J | September |
| K | October |
| L | November |
| M | December |
Example: serial 5899L17212 decodes to November 1999.
Listed under Lennox in the source; Allied Air is named in that format's family and the corporate link is an estimate, not a checked fact.
1970 to 1977 formatVERIFIED
Shape ##A##AA### · example 15A67JA098 · confidence medium
- Year
- digits 4-5 = year REVERSED (67 = 1976)
- Week or month
- day = digits 1-2; month = letter 3 (A=Jan .. M=Dec, I skipped)
- Plant
- letter 6: J = Bellevue OH, A = Columbus OH (letter 7 'A' = n/a)
| Month code | Month |
|---|---|
| A | January |
| B | February |
| C | March |
| D | April |
| E | May |
| F | June |
| G | July |
| H | August |
| J | September |
| K | October |
| L | November |
| M | December |
| Plant code | Plant |
|---|---|
| A | Columbus, Ohio |
| J | Bellevue, Ohio |
Example: serial 15A67JA098 decodes to January 1976.
era not stated formatVERIFIED
Shape ####A##### · example 4601J19567 · confidence high
- Year
- digits 3-4 = YY (4601J19567 = 2001; 1606B13871 = 2006; 4607B20058 = 2007)
- Week or month
- month = letter 5 (A=Jan .. M=Dec, I not used)
- Plant
- digits 1-2 = plant: 46 Blackville, 84 Bellevue, 16 Allied Orangeburg, 60 ADP, 56 Lennox
| Month code | Month |
|---|---|
| A | January |
| B | February |
| C | March |
| D | April |
| E | May |
| F | June |
| G | July |
| H | August |
| J | September |
| K | October |
| L | November |
| M | December |
Example: serial 4601J19567 decodes to September 2001.
era not stated formatVERIFIED
Shape ########## · example 4140720328 · confidence high
- Year
- digits 7-8 = YY (4140720328 = 2003; 0183290431 = 2004)
- Week or month
- week = digits 9-10 (28; 31 = end of August)
Example: serial 4140720328 decodes to week 28 of 2003.
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 Lennox lookup takes serial (####A#####, A##A######, AA##A#####); returns Your Product's Coverage; 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
- Allied Air is treated as sharing Lennox's format because the source lists it in that family; the corporate relationship itself is an estimate.
- No official online lookup URL was verified for Allied Air.
Sources
- https://www.building-center.org/lennox/
- https://www.lennox.com/residential/owners/assistance/warranty/official
- https://www.building-center.org/concord-hvac-age/
- https://www.building-center.org/wp-content/uploads/2018/06/Concord-Style-2.png
- https://www.building-center.org/airease-hvac-age/
- https://www.building-center.org/ducane-hvac-age/
- https://www.building-center.org/armstrong-air-hvac-age/
- https://www.building-center.org/magic-pak-hvac-age/
- https://www.building-center.org/allied-commercial-hvac-age/
- https://www.building-center.org/aire-flo-hvac-age/
- https://www.building-center.org/wp-content/uploads/2023/12/Ducane-HVAC-style-1.jpg
- https://www.building-center.org/wp-content/uploads/2018/06/Concord-Style-1.png
- https://www.building-center.org/wp-content/uploads/2015/09/Style-3_Airease-Date-of-Manufacture_Serial-Number-Nomenclature1.png
