Heil furnace and AC age by serial number
Heil furnaces and air conditioners usually start the serial with a plant letter followed by the year and the week. Some units use an all-digit start instead, and this Heil serial number lookup checks every style for the Heil manufacture date.
Where do I find the serial number?
Remove the lower door on a Heil furnace and look for the rating plate on the inside wall of the cabinet. On the outdoor unit, the plate is on the cabinet near the service panel.
How to read a Heil serial number
The common Heil serial is a letter and nine digits. The letter is the plant, digits two and three are the year and digits four and five are the week. Two less common styles start with four digits followed by a letter: one reads year then week, the other week then year.
Plant letter, year, week, sequence
- Used
- 1980s to present
- Format
- Plant letter, year, week, sequence
- Example
- E072514528
Example, read
Year, week, letter, sequence
- Used
- 1990s onward
- Format
- Year, week, letter, sequence
- Example
- 9845B12345
Example, read
Only one source documents this format. It has the same shape as the week-first format, so we try both readings and show every one that fits.
Week, year, letter, sequence (Carrier style)
- Used
- 2006 onward on some lines
- Format
- Week, year, letter, sequence (Carrier style)
- Example
- 2806A12345
Example, read
Reported on some Day & Night units from 2006 on.
Where to find the serial number
Remove the lower door on a Heil furnace and look for the rating plate on the inside wall of the cabinet. On the outdoor unit, the plate is on the cabinet near the service panel.
Brands with the same format
Tempstar, Comfortmaker and Day & Night use the same serial format as Heil.
Questions
How old is my Heil furnace?
Skip the first letter. The next two digits are the year and the two after that are the week. G051650885 reads as week 16 of 2005.
Why does my Heil serial show two possible dates?
Serials that start with four digits and a letter fit two documented styles. 1206A12345 could be week 6 of 2012 or week 12 of 2006, so we show both.
Which reading is right for a four-digit Heil serial?
Look at the unit's condition, its installation paperwork, or any date printed on the plate. Both styles come from limited sources, so we do not choose for you.
Do Tempstar, Comfortmaker and Day & Night use the same format?
Yes. Tempstar, Comfortmaker and Day & Night use the same serial format as Heil.
Can a Heil date be before 1980?
Not in the styles we decode. We accept years from 1980 on for these formats.
Can I look up a Heil model number here?
No. A Heil model number describes the unit's type and size. This site dates equipment from the serial number only.