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ICP family

How old is my International Comfort Products furnace?

Enter the serial number from the label. The date comes from International Comfort Products'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 International Comfort Products furnace serial number

International Comfort Products (ICP) lists Heil, Tempstar, Comfortmaker, Arcoaire, KeepRite and AirQuest among the brands it makes, and their modern serials share one layout: a plant letter, two digits for the year, two for the week, then a five-digit sequence. Plates with a printed manufacture date confirm it from 1992 through October 2015. No newer dated example has turned up yet, so later units are assumed to follow the same layout.

  • 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.

International Comfort Products 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?.

International Comfort Products furnace recalls

No International Comfort Products 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

Is there an official source for the ICP serial format?
The closest is a 2005 CPSC recall of ICP packaged gas/electric units. It gives the affected production period in weeks (week 41 of 2000 to week 26 of 2003) and shows a typical serial in this letter-plus-nine-digits shape. The rest of the evidence is plates that print their own manufacture date, plus inspector references that agree with them.
Is Day & Night part of this family?
ICP sells Day & Night today, but older Day & Night units were Carrier-built and use Carrier’s week-then-year serials, which we decode with the Carrier rules. Newer Day & Night serials in ICP’s letter-plus-nine-digits layout aren’t decoded yet: we have only one dated example, and its photo doesn’t show the brand.
Can the model number tell me which ICP brand I have?
Not reliably. ICP’s brand sites sell the same model under several names: the C5H8T outdoor unit is listed by Comfortmaker, KeepRite and Day & Night, and N-series models appear under every ICP brand. The serial rule is the same whichever badge is on the unit.
How can I tell how old my International Comfort Products furnace is?
Find the serial number on the rating plate and enter it above. International Comfort Products 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 International Comfort Products 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, KeepRite and AirQuest furnaces use the same serial format?
Yes. International Comfort Products, Heil, Tempstar, Comfortmaker, Arcoaire, KeepRite and AirQuest 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, KeepRite furnace, AirQuest furnace

Other International Comfort Products 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.