Heil Serial Number Lookup
Heil serials start with a plant letter, then the two-digit year and the two-digit week, so E1423… is week 23 of 2014. Enter yours below. The same code covers Tempstar, Comfortmaker, Arcoaire and Day & Night.
Part of the hvac age lookup
Serial number age lookup
Where to find the serial number on Heil equipment
- Outdoor AC or heat pump: on the rating plate on the side of the cabinet, close to the electrical panel.
- Furnace: inside the blower door; some models also have a label on the outer side of the cabinet.
- Coil or air handler: on the cabinet itself.
A Heil serial is usually ten characters: one letter followed by nine digits, such as E142312345. Heil model numbers start with letters and include the size (for example a 036 for 3 tons), so they’re easy to tell apart.
How the Heil date code works
| Part | Example (E142312345) | Meaning |
|---|---|---|
| Letter | E | Plant |
| 2 digits | 14 | Year (2014) |
| 2 digits | 23 | Week (early June) |
| rest | 12345 | Sequence |
- Year
- Week
- Not part of the date
Worked examples
| Serial | Built |
|---|---|
| E142312345 | June 2014 (week 23) |
| L943312345 | August 1994 (week 33) |
| W061812345 | May 2006 (week 18) |
| A210712345 | February 2021 (week 7) |
Example serials are made up to show the format; they don't belong to real units.
Don’t confuse it with Carrier
ICP is part of Carrier, but Heil does not use Carrier’s serial code. Carrier puts the week first (2406… = week 24 of 2006), while Heil puts the year first, after the plant letter. If you decode a Heil unit with a Carrier chart, you’ll get the wrong year.
Heil and ICP
Heil is the flagship brand of International Comfort Products, which builds residential equipment in Lewisburg, Tennessee. ICP sells nearly identical products under several names, each through its own distributor network: Heil, Tempstar, Comfortmaker, Arcoaire and Day & Night in the US, plus KeepRite in Canada. Heil’s lineup includes its QuietComfort equipment.
Because the brands share designs, many Heil parts cross over to Tempstar or Comfortmaker models with matching specifications, which is useful when one brand’s parts are hard to find locally.
How long Heil equipment lasts
| Equipment | Typical life |
|---|---|
| Central air conditioner | 12–17 years |
| Heat pump | 10–15 years |
| Gas furnace | 15–20 years |
Late-life warning signs
- Repeated refrigerant top-ups or oily residue on refrigerant lines
- Capacitors and contactors failing more often
- Furnace ignition lockouts, or an inducer motor that gets noisy
- Rust inside the furnace cabinet, especially on condensing furnaces with drain problems
What to do with your result
Under 10 years: check your registered warranty; ICP brands typically offer 10-year parts coverage on registered units.
10 to 15 years: maintain, repair small parts, and get a replacement price before agreeing to a major repair.
Over 15 years: plan a replacement on your own schedule. If the AC uses R-22, refrigerant repairs are costly.
Frequently asked questions
How do I read a Heil serial number?
Skip the first letter (the plant). The next two digits are the year and the two after that are the week. E142312345 was built in week 23 of 2014, early June.
Who makes Heil?
International Comfort Products (ICP), which has been part of Carrier since the late 1990s. ICP also makes Tempstar, Comfortmaker, Arcoaire and Day & Night.
Why do some sources say the year is in positions 2 and 3?
Because they count the plant letter as position 1. Whichever way you count, the two digits straight after the letter are the year and the next two are the week.
How long does a Heil air conditioner last?
About 12 to 17 years for a central AC, 10 to 15 for a heat pump and 15 to 20 for a gas furnace.
Sources and accuracy
The ICP: Heil / Tempstar / Comfortmaker / Arcoaire / Day & Night decoder is built from these references and cross-checked between them. Facts are restated in our own words; any mistakes are ours.
Status: being verified against real data plates. Rules last reviewed 2026-10-18; page updated 2026-11-02. Not affiliated with ICP: Heil / Tempstar / Comfortmaker / Arcoaire / Day & Night. Report a wrong result.
Part of the hvac age lookup
This page covers one brand. For all furnace, air conditioner and heat pump brands, go to the hvac age lookup.