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ICP family

How old is my International Comfort Products equipment?

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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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.

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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 do I find the age of my International Comfort Products equipment?
Enter the serial number from the rating plate above. International Comfort Products uses the ICP family serial format, which includes the manufacture date.

Heil, Tempstar, Comfortmaker, Arcoaire, KeepRite, AirQuest

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.