HVAC Serial Number Lookup
Ducane Serial Number Lookup
Ducane is part of the Allied Air family, alongside AirEase, Armstrong Air, Concord. Enter the serial from the data plate below to get the manufacture date with a character-by-character explanation, the unit's age, its refrigerant era, and the warranty picture.
Decode schemes compiled from manufacturer literature and inspector references, cross-checked across two sources wherever possible (Ducane sources: building-center.org + inspectorhandbook + howtolookatahouse; building-center.org + howtolookatahouse + inspectorhandbook; howtolookatahouse (full table) + inspectorhandbook (shape and one matching example)). Single-sourced rules are labeled low confidence instead of being presented as fact. A date stamped or printed on the data plate always outranks a serial decode.
Ducane Serial Number Formats
| Format | Era | Example | Confidence |
|---|---|---|---|
| 4 digits + letter + 5 digits; digits 3-4 = year, the letter = month (A-M, skipping I) | ~2000s to present | 4607B20058 = February 2007 | high |
| 10 digits; the final four are year then week (digits 7-8 = year, 9-10 = week) | ~1990s to 2000s | 4140720328 = week 28 of 2003 (mid-July) | high |
| Letter + 5 digits + trailing letters; the second-to-last letters are month then year (year letters A=1980 to N=1992, skipping I) | 1978 to 1992 | A10322EDDB = May 1983 (estimated) | low |
Worked Example: Ducane 4601J19567
Expected decode: September 2001 (same serial documented on Ducane and Concord). Character by character:
46 = plant/line code (digits 1-2)
01 = year 2001 (digits 3-4)
J = September (month letters A to M, skipping I)
19567 = production sequence
Ducane Refrigerant Timeline
| Manufacture year | Typical refrigerant | Notes |
|---|---|---|
| through 2009 | R-22 | Standard refrigerant of the era. Production of new R-22 ended in 2020; supply is reclaim-only. Allied R-410A models carry a leading 4 in the model number. |
| 2010 to 2024 | R-410A | EPA banned R-22 in new equipment from January 1, 2010; R-410A was the standard through 2024. |
| 2025 and later | R-454B | Armstrong Air, AirEase, Concord, Ducane, Allied Commercial, and MagicPak all moved to R-454B for January 2025, matching parent Lennox's ducted choice. |
The refrigerant printed on the nameplate is authoritative; this timeline tells you what is typical for the age, not what is in a specific unit.
Ducane Warranty Baseline
Current policy: 10-year parts registered within 60 days (furnaces add a limited lifetime heat exchanger); unregistered drops to 5-year parts and a 20-year heat exchanger.
Source: armstrongair.com warranty pages. Decode the manufacture date above, then confirm coverage through the manufacturer's own serial-number warranty lookup.
Frequently Asked Questions
How old is my Ducane unit?
Decode the serial number from the data plate. The dominant Ducane format (~2000s to present) is: 4 digits + letter + 5 digits; digits 3-4 = year, the letter = month (A-M, skipping I). Example: 4601J19567 decodes to September 2001 (same serial documented on Ducane and Concord). Subtract the decoded year from the current year for the age. Units past 15 years are replacement candidates, and past 20 a major repair rarely pays off.
Which brands share the Ducane serial number format?
Ducane is part of the Allied Air family, alongside AirEase, Armstrong Air, and Concord. These brands come off shared production lines with the same data plates, so one decode rule dates all of them, and the refrigerant and warranty picture is the same across the family.
What refrigerant does a Ducane unit use?
By manufacture year: through 2009: R-22; 2010 to 2024: R-410A; 2025 and later: R-454B. The refrigerant printed on the nameplate is authoritative; the year-based mapping tells you what is typical for the age, not what is in a specific unit.
Is my Ducane unit still under warranty?
Current policy: 10-year parts registered within 60 days (furnaces add a limited lifetime heat exchanger); unregistered drops to 5-year parts and a 20-year heat exchanger. Decode the manufacture date above, then confirm coverage by running the full serial through the manufacturer's own warranty lookup. Terms shown are the current policy; older units often carried different terms.
Related Tools
HVAC Serial Number Lookup (All Brands)
The full decoder: 50+ brands across every major manufacturer family, with ambiguous formats shown honestly.
Tonnage From Model Number
The serial tells you the age; the model number tells you the size. Decode BTU capacity and tons from the model.
A2L Refrigerant Charge Limit Calculator
Replacing an old unit with R-454B or R-32 equipment? Check the room-size charge limits per UL 60335-2-40.
Same family, same decode rules: AirEase serial number lookup, Armstrong Air serial number lookup, Concord serial number lookup.
Different brand on the data plate?
The full lookup covers 50+ brands across every major manufacturer family, with the same honest handling of ambiguous and undocumented formats.