SerialAtlas
Offline-capable

HVAC date-code guide

Coleman HVAC serial number lookup

Coleman HVAC equipment is part of the Johnson Controls/York family and often uses the same split-year and month-letter date code.

Parent
Johnson Controls
Common code
In a common modern style, characters 2 and 4 form the year while character 3 is a month letter.
Reviewed
August 8, 2026

Instant equipment lookup

Decode the manufacturing date

Runs on this device
Equipment type

Using In a common modern style, characters 2 and 4 form the year while character 3 is a month letter.

Type exactly what is printed. Spaces and dashes are ignored.

Optional: add model number for capacity cluesAdd model

Model decoding is labeled as a clue unless the exact format is documented.

No signupNo uploadNo serial-number tracking

EQUIPMENT DATA
MODEL24ABC636A003
SERIAL5019X30312
WeekYear

See exactly how the code was read

SerialAtlas highlights the date characters, names the matching rule, and shows alternative interpretations when the code is ambiguous.

  • Current age calculated automatically
  • Confidence and rule source shown
  • Optional model-capacity clue

Evidence-led route update

Coleman HVAC date-code evidence

If you need to estimate a Coleman unit’s manufacture age, read the split year and month letter used by the common York-family format.

Combine the split York-family year digits

In a common modern style, characters 2 and 4 form the year while character 3 is a month letter. The verified Coleman/York style combines characters 2 and 4 for the year and uses character 3 as the month letter. That is a position-based rule, so copying a different brand’s prefix would be unsafe. Coleman HVAC is represented by the verified York-family style in which characters 2 and 4 form the year and character 3 supplies the month letter. The split positions are why a generic front-prefix read would be unsafe.

Worked example: W0K5896070

W0K5896070 — The verified decoder reads this fixture as October 2005. The date is a manufacture estimate, not an installation date.

When an older Coleman unit needs a different York read

Older and manufactured-home Coleman equipment can use another York-family format. Preserve the full plate and use official support or a qualified professional when the serial positions do not match.

Model number vs. serial number

The Coleman model identifies the manufactured-home or HVAC product context and the serial supplies the split date evidence; provide both for support. Check the furnace, outdoor unit, heat pump, or packaged-unit plate and record the complete model and serial for support.

Limits and official support

Older Coleman and manufactured-home equipment can use another York-family format. If the result affects warranty, registration, parts, safety, or replacement decisions, use the complete model and serial with the manufacturer or a qualified professional. SerialAtlas is an independent reference, not an official warranty lookup or warranty coverage decision.

Open Coleman HVAC support route

How to read a Coleman HVAC serial number

In a common modern style, characters 2 and 4 form the year while character 3 is a month letter. SerialAtlas removes spacing and punctuation, then applies only the documented rule families mapped to Coleman HVAC. The lookup remains in the browser.

Try this documented-style exampleW0K5896070Load example

Equipment covered

  • air conditioners
  • heat pumps
  • furnaces
  • air handlers
  • packaged systems

Commercial, imported, very old, specialty, and private-label equipment can use a different code. Confirm the full rating plate before accepting a result.

Where to find the rating plate

  • Outdoor condenser or heat-pump cabinet, usually near the service valves
  • Inside the furnace or air-handler access panel
  • On the packaged-unit rating plate
  • Near the electrical disconnect or wiring diagram

Why more than one date can appear

Two-digit years and repeating letter cycles can point to more than one era. SerialAtlas ranks the plausible dates but keeps materially different alternatives visible. Label design, refrigerant, installation records, and product literature can resolve the era.

Source and verification

Inspector Handbook open reference data (CC BY 4.0). Independently implemented and reviewed August 8, 2026.

Open reference source

What this result does not prove

A manufacture date is not an installation date, warranty decision, recall match, condition assessment, or replacement recommendation. Confirm high-stakes decisions with the manufacturer or a qualified professional.