SerialAtlas
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HVAC date-code guide

Tempstar serial number lookup

Tempstar is an ICP residential brand and commonly uses the same letter-plus-year-and-week serial layout as its sister labels.

Parent
International Comfort Products / Carrier Global
Common code
A plant letter is followed by a two-digit year and two-digit production week (LYYWW).
Reviewed
August 8, 2026

Instant equipment lookup

Decode the manufacturing date

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Equipment type

Using A plant letter is followed by a two-digit year and two-digit production week (LYYWW).

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

Tempstar date-code evidence

If you need to estimate a Tempstar unit’s manufacture age, read the plant letter, year, and production week at the front of the serial.

Read the ICP plant-year-week serial prefix

A plant letter is followed by a two-digit year and two-digit production week (LYYWW). The verified ICP family uses LYYWW: a plant letter followed by two year digits and two production-week digits. Tempstar shares that family with selected ICP sister labels. The verified Tempstar family uses a plant letter followed by two year digits and two production-week digits. The ICP family relationship is useful evidence, while the Tempstar label and market remain part of the route decision.

Worked example: E142320733

E142320733 — The verified decoder reads this fixture as Week 23 of 2014. The date is a manufacture estimate, not an installation date.

When a Tempstar market or era is unclear

A Canadian, legacy, private-label, or otherwise different ICP product may need another reference. Confirm the full model and serial with official support before using the estimate for warranty or replacement planning.

Model number vs. serial number

The Tempstar model identifies the HVAC product and the serial supplies the ICP date prefix; use both for support. Confirm the brand printed on the plate and save the complete model/serial pair before a warranty or parts conversation.

Limits and official support

ICP labels can vary by era, market, and product line. 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 Tempstar support route

How to read a Tempstar serial number

A plant letter is followed by a two-digit year and two-digit production week (LYYWW). SerialAtlas removes spacing and punctuation, then applies only the documented rule families mapped to Tempstar. The lookup remains in the browser.

Try this documented-style exampleE142320733Load 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.