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UnitAge
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ICP family

How old is my Heil equipment?

Enter the serial number from the label. The date comes from Heil'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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Heil is one of the brands International Comfort Products (ICP) names in its own furnace warranty, and Heil equipment uses the ICP serial layout: a plant letter, two digits for the year, two for the week, then a sequence number. We decode that layout from 1988 on, for Heil furnaces, air conditioners, heat pumps, air handlers and packaged units. Older Heil serials in other styles aren’t decoded.

By equipment type

Questions

My Heil serial starts with an H and has only nine characters. Can you date it?
Not yet. Industry references describe an older Heil style that starts with a decade letter, with H standing for the 1980s, but only the H is backed by sources that agree; the other decade letters come from a single source. Rather than guess, we leave these serials undecoded; if the plate prints a manufacture date, use that.
Does a model number starting with H mean the unit is a Heil?
Not on its own. ICP’s brand sites list the same H5H8T outdoor unit under Heil, Arcoaire and AirQuest, and G-series furnaces under Heil, Comfortmaker, KeepRite, AirQuest and Day & Night. Check the brand name on the cabinet; the serial rule is the same for all of these brands.
How do I find the age of my Heil equipment?
Enter the serial number from the rating plate above. Heil uses the ICP family serial format, which includes the manufacture date.

Tempstar, Comfortmaker, Arcoaire, KeepRite, AirQuest, International Comfort Products

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.