Tempstar furnace and AC age by serial number
Most Tempstar serials begin with a plant letter, then the year and the week the unit was built. Type yours into this Tempstar serial number lookup and we will read the Tempstar manufacture date, or show both readings if the serial could mean two.
Where do I find the serial number?
Tempstar furnaces have the data plate on the inside of the cabinet, behind the blower access door. Outdoor Tempstar condensers and heat pumps show it on a side panel, usually the one with the wiring cover.
How to read a Tempstar serial number
Look at the first character. If it is a letter, the next four digits are the year and the week, so L920671787 reads as week 6 of 1992. If the serial starts with four digits and then a letter, it can be year then week or week then year, and the decoder keeps every reading that is a real date.
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
Tempstar furnaces have the data plate on the inside of the cabinet, behind the blower access door. Outdoor Tempstar condensers and heat pumps show it on a side panel, usually the one with the wiring cover.
Brands with the same format
Heil, Comfortmaker and Day & Night use the same serial format as Tempstar.
Questions
How old is my Tempstar furnace?
Read the two digits after the first letter as the year, then the next two as the week.
Why might a Tempstar serial have two dates?
When a serial starts with four digits and a letter, both a year-week and a week-year reading can be valid. We list both rather than guess.
What does 9845B12345 mean on a Tempstar?
98 is the year and 45 is the week, so it reads as week 45 of 1998. The other reading would need a week 98, which does not exist.
Does Tempstar use the same serial format as Heil?
Yes. Tempstar, Heil, Comfortmaker and Day & Night serials are all read with the same rules.
Is the Tempstar serial date the install date?
It is the build date. Check the installer's paperwork or a dated sticker on the cabinet for when it went in.
Can I look up a Tempstar model number here?
No, we decode serial numbers only. The Tempstar model number identifies the kind of equipment and its capacity, not its age.