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Lennox family

How old is my AirEase heat pump?

Enter the serial number from the label. The date comes from AirEase'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 AirEase heat pump serial number

  • Plant + year + month letter (Lennox since the 1970s; Allied brands since 1993)

    Example: 1602J39640 (AirEase) was made in September 2002. Lennox-family serials start with a two-digit plant code (16), then the year (2002) and a month letter ("J" = September; the letter I is skipped, so J is September).

  • Allied letter format (Armstrong Air / AirEase, 1978–1992)

    Example: C89274AAC (Armstrong Air) was made in January 1980. On Armstrong Air and AirEase units built 1978–1992, the 7th character is the month ("A" = January) and the 8th is the year ("A" = 1980).

Not decoded yet: Older all-numeric Ducane/Concord serials, pre-1973 Lennox and 1970s AirEase formats, and Lennox ductless units are not decoded yet.

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.

AirEase heat pump model numbers

If the brand name isn't visible on the label, the model number can help. Model numbers like these follow the Armstrong Air / AirEase 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?.

AirEase heat pump recalls

No AirEase heat pump recalls were found in U.S. Consumer Product Safety Commission data when this page was checked (2026-09-29). A decoded result checks your model number live.

Questions

How can I tell how old my AirEase heat pump is?
Find the serial number on the rating plate and enter it above. AirEase heat pumps use the Lennox family serial format, which includes the manufacture date. For example, 1602J39640 was made in September 2002: Lennox-family serials start with a two-digit plant code (16), then the year (2002) and a month letter ("J" = September; the letter I is skipped, so J is September).
Where is the serial number on a AirEase 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 Lennox, Armstrong Air, Ducane and Concord heat pumps use the same serial format?
Yes. AirEase, Lennox, Armstrong Air, Ducane and Concord use the same serial-number conventions (Lennox family), so the same decoding rules apply.
How reliable is the result?
The Lennox 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: Lennox heat pump, Armstrong Air heat pump, Ducane heat pump, Concord heat pump

Other AirEase 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.