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Carrier family

How old is my Carrier heat pump?

Enter the serial number from the label. The date comes from Carrier's documented serial rules, not a guess.

Look for “Serial No.” or “S/N” on the label. Spaces and dashes are fine.

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How to read a Carrier heat pump serial number

Since at least 1988, Carrier-built equipment has used a 10-character serial: the first two digits are the production week, the next two are the year, then a factory letter and a five-digit sequence.

  • Week + year, plant letter, sequence (1988 onward)

    Example: 4006A17330 (Carrier) was made in October 2006. In Carrier, Bryant and Payne serials the first two digits are the week (40) and the next two are the year (2006). The letter after them is the factory.

Not decoded yet: Pre-1988 Carrier, Bryant and Payne formats (month letters, week + year letter, all-numeric) are not decoded because sources disagree.

Where to find the serial number

The rating plate is on the outdoor unit, usually on the side or back of the cabinet near the electrical disconnect.

The indoor air handler has its own plate and its own serial number, so check which unit you're decoding.

Carrier heat pump model numbers

If the brand name isn't visible on the label, the model number can help. Model numbers like these follow Carrier's published nomenclature:

How long does a heat pump last?

A typical heat pump lasts about 10–15 years. That's a general estimate: maintenance, usage, climate and installation all matter, and age alone doesn't tell you a unit's condition.

Range from InterNACHI: standard estimated life expectancy chart, Carrier: how long do heat pumps last? and Lennox: how long do heat pumps last?.

Carrier heat pump recalls

From the U.S. Consumer Product Safety Commission, checked 2026-09-29. A decoded result checks your model number against recalls live.

Questions

How can I tell how old my Carrier heat pump is?
Find the serial number on the rating plate and enter it above. Carrier heat pumps use the Carrier family serial format, which includes the manufacture date. For example, 4006A17330 was made in October 2006: In Carrier, Bryant and Payne serials the first two digits are the week (40) and the next two are the year (2006). The letter after them is the factory.
Where is the serial number on a Carrier heat pump?
The rating plate is on the outdoor unit, usually on the side or back of the cabinet near the electrical disconnect. The indoor air handler has its own plate and its own serial number, so check which unit you're decoding.
How long does a heat pump usually last?
A typical service life is about 10–15 years. That's a general estimate: maintenance, usage, climate and installation all matter, and age alone doesn't tell you a unit's condition.
Do Bryant, Payne and Day & Night heat pumps use the same serial format?
Yes. Carrier, Bryant, Payne and Day & Night use the same serial-number conventions (Carrier family), so the same decoding rules apply.
How reliable is the result?
The Carrier family rules come from documented sources, but they're in Beta while we check more real-world examples, so results are capped at medium confidence. If a serial doesn't match a documented format, we say so instead of guessing.

Same serial format: Bryant heat pump, Payne heat pump, Day & Night heat pump

Other Carrier equipment: furnace, air conditioner

Sources

Rules last reviewed 2026-09-28. These rules are in Beta while we verify more real-world examples, so results are capped at medium confidence.

Manufacture dates are decoded from manufacturer serial-number conventions and available documentation. Serial formats can change. Verify critical equipment information with the manufacturer when necessary.