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ICP family

How old is my KeepRite furnace?

Enter the serial number from the label. The date comes from KeepRite'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 KeepRite furnace serial number

  • Plant letter + year + week (1988 onward)

    Example: A154116798 (Tempstar) was made in October 2015. ICP serials (Heil, Tempstar, Comfortmaker, Arcoaire and others) start with a plant letter ("A"), then two digits for the year (2015) and two for the week (41).

Not decoded yet: Serials shaped like 4 digits + letter + 5 digits are not decoded: sources disagree on whether the year or week comes first. 1970s–80s letter formats are also not decoded.

Where to find the serial number

Turn the furnace off at its switch, then remove the upper access door (the burner or blower compartment). The rating plate is on the inside wall of the cabinet or on the back of the door.

The plate lists the model number and serial number; many newer plates also print a date of manufacture.

KeepRite furnace model numbers

If the brand name isn't visible on the label, the model number can help. Model numbers like these follow the Heil / Tempstar / Comfortmaker / Arcoaire / KeepRite / AirQuest / International Comfort Products nomenclature:

How long does a furnace last?

A typical furnace lasts about 15–20 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 NAHB / Bank of America, Study of Life Expectancy of Home Components (2007, archived copy), Carrier: how long does a furnace last? and Lennox: how long does a furnace last?.

KeepRite furnace recalls

No KeepRite furnace 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 KeepRite furnace is?
Find the serial number on the rating plate and enter it above. KeepRite furnaces use the ICP family serial format, which includes the manufacture date. For example, A154116798 was made in October 2015: ICP serials (Heil, Tempstar, Comfortmaker, Arcoaire and others) start with a plant letter ("A"), then two digits for the year (2015) and two for the week (41).
Where is the serial number on a KeepRite furnace?
Turn the furnace off at its switch, then remove the upper access door (the burner or blower compartment). The rating plate is on the inside wall of the cabinet or on the back of the door. The plate lists the model number and serial number; many newer plates also print a date of manufacture.
How long does a furnace usually last?
A typical service life is about 15–20 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 Heil, Tempstar, Comfortmaker, Arcoaire, AirQuest and International Comfort Products furnaces use the same serial format?
Yes. KeepRite, Heil, Tempstar, Comfortmaker, Arcoaire, AirQuest and International Comfort Products use the same serial-number conventions (ICP family), so the same decoding rules apply.
How reliable is the result?
The ICP 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: Heil furnace, Tempstar furnace, Comfortmaker furnace, Arcoaire furnace, AirQuest furnace, International Comfort Products furnace

Other KeepRite equipment: air conditioner, heat pump

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.