Carrier furnaces, air conditioners and heat pumps built from the early 1990s onward encode the manufacture date directly in the serial number printed on the equipment's rating plate, not in the model number. On the ten-character format used across this era, the first two digits are the production week, from 01 through 52, and the next two digits are the two-digit year. A letter follows, marking the assembly plant, and the remaining digits are a sequential unit count within that week.
A serial beginning 2914 was built in week 29 of 2014, in mid-July. This ordering is not a guess: Carrier's own enhanced-warranty eligibility page lists starting and ending serial numbers, 2993A00001 through 5211A99999, for furnaces built between 1993 and 2011 — decoded as week 29 of 1993 through week 52 of 2011, matching the stated eligibility years exactly. Carrier equipment made before 1993 used different formats not covered here.
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Decode your own serial number
What this covers
- Carrier residential furnaces, air conditioners and heat pumps with a 10-character serial number (four digits, one letter, five digits) on the rating plate
- Equipment built from approximately 1993 to the present
- Reading the production week (01–52) and two-digit year from the serial's first four digits
What it does not cover
- ×Carrier equipment built before roughly 1993, which used different, unverified formats
- ×Bryant, Payne or Day & Night siblings, which are not confirmed to share this exact range
- ×The model number, which encodes capacity and configuration, not the date
Try in this order
0 of 4 completedLocate the rating plate
ReversibleOn a furnace, check inside the front access panel with the unit off. On an outdoor condenser or heat pump, check the exterior panel near the service valves. The serial number is separate from the model number.
Read the first four digits
ReversibleThe first two digits are the production week (01–52). The next two digits are the two-digit year. A serial starting 2914 means week 29 of 2014.
Cross-check with the fifth character
ReversibleThe letter that follows the first four digits identifies the assembly plant, not the date — it will not change the week/year reading above.
Treat pre-1993 serials as unverified here
ReversibleIf the equipment looks older than the 1993–present range (a 9-character serial, or a format that does not fit four digits plus a letter), this page's rule does not apply with the same confidence — use Carrier's dealer network for that equipment.
Evidence ledger
Sources behind this answer
Official Carrier page listing the eligible serial-number range 2993A00001 through 5211A99999 for furnaces built 1993–2011. Carrier does not spell out the week/year reading on this page; it is derived here from the range's own internal consistency (2993 = week 29 of 1993, 5211 = week 52 of 2011, matching the stated years exactly) and. Verified Sept. 10, 2026.
Independent HVAC-trade reference documenting the same week-then-year reading (positions 1–2 = week, 3–4 = year) as the format used since 1980, plus several older, less certain formats not repeated here. Verified Sept. 10, 2026.
Exact questions
Questions about Decode a Carrier serial number
Does the serial number show the exact day my Carrier furnace was made?+
No. It shows the production week and year, not the day. A serial starting 2914 means week 29 of 2014, a roughly seven-day window.
How do I know my Carrier serial uses this format and not an older one?+
This format is a 10-character serial: four digits, one letter, five more digits. If the serial looks different — for example, 9 characters with no clear four-digit lead-in — treat the reading as unverified rather than forcing it.
Does a 2011-or-earlier manufacture date mean my furnace is still under Carrier's enhanced warranty?+
Not automatically. The 1993–2011 serial range only establishes eligibility; confirm actual coverage through Carrier's warranty lookup or an authorized dealer.
How do I read the serial?+
Compare against the format.
Where is the label?+
On the unit.
Is it exact?+
Approximate.