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Nordyne / Nortek family

How old is my Garrison heat pump?

Enter the serial number or take a photo of the label. The date comes from Garrison's documented serial rules; AI only helps read the label.

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

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How to read a Garrison heat pump serial number

  • Plant/product + year + month + sequence (about 1989 onward)

    Example: B6D130407356 (Nordyne) was made in April 2013. Nordyne serials are 12 characters: the 4th and 5th are the year and the 6th and 7th the month, so "13" is 2013 and "04" is April.

Not decoded yet: Rheem-built plates marked "Manufactured for Nordyne", older Frigidaire/Philco/Westinghouse serials ending in a year and month letter, 1970s Westinghouse serials, Mammoth and Reznor commercial units, and anything before these brands used the Nordyne format.

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.

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?.

Garrison heat pump recalls

No Garrison heat pump recalls were found in U.S. Consumer Product Safety Commission data when this page was checked (2026-09-30). A decoded result checks your model number live.

Questions

How can I tell how old my Garrison heat pump is?
Find the serial number on the rating plate and enter it above. Garrison heat pumps use the Nordyne / Nortek family serial format, which includes the manufacture date. For example, B6D130407356 was made in April 2013: Nordyne serials are 12 characters: the 4th and 5th are the year and the 6th and 7th the month, so "13" is 2013 and "04" is April.
Where is the serial number on a Garrison 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 Nordyne, Intertherm, Miller, Broan, NuTone, Medallion, GrandAire, Frigidaire, Gibson, Kelvinator, Philco, Tappan, Westinghouse and Maytag heat pumps use the same serial format?
Yes. Garrison, Nordyne, Intertherm, Miller, Broan, NuTone, Medallion, GrandAire, Frigidaire, Gibson, Kelvinator, Philco, Tappan, Westinghouse and Maytag use the same serial-number conventions (Nordyne / Nortek family), so the same decoding rules apply.
How reliable is the result?
The Nordyne / Nortek 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: Nordyne heat pump, Intertherm heat pump, Miller heat pump, Broan heat pump, NuTone heat pump, Medallion heat pump, GrandAire heat pump, Frigidaire heat pump, Gibson heat pump, Kelvinator heat pump, Philco heat pump, Tappan heat pump, Westinghouse heat pump, Maytag heat pump

Other Garrison equipment: furnace, air conditioner

Sources

Rules last reviewed 2026-09-30. 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.