How do you read a Goodman serial number?
Goodman’s and Amana’s warranty certificates say the first four digits of the serial number, YYMM, show the manufacture date. The same sentence appears in the furnace and air conditioner certificates, so one rule covers both. Goodman’s technical bulletins list real serials whose build dates match: on a Goodman packaged unit, 1804165082 was built on April 11, 2018.
Sources: Limited Warranty, Models GD9S96, GR9S96 and others (PWCFURNTWQNT), checked October 19, 2026; Limited Warranty, Models AD9S96, AR9S96 and others (PWAFURNTFQ), checked October 19, 2026; SP-039 GPC1436H41DD and GPG1436040M41AB Serial/Rating Label, checked October 19, 2026.| Digits | What they mean | In 1804165082 |
|---|---|---|
| 1 and 2 | Year of manufacture | 18: 2018 |
| 3 and 4 | Month of manufacture (01 to 12) | 04: April |
| 5 to 10 | Production number | 165082 |
What will the home systems age report add?
The home systems age report will put your Goodman furnace next to every other major system in your home, each with its build year, how long that kind of system typically lasts, and what to budget for replacing it.
Get the home systems age report
We’re building a home systems age report: your Goodman furnace and every other major system, each with its age, typical life and replacement budget.
Where is the serial number on a Goodman furnace?
Goodman puts the rating plate on the inner wall of the furnace, so you’ll need to look behind the front panel. Goodman suggests involving a dealer to get to it, and a technician can read it for you if you’d rather not turn the power off and remove the panel. The serial is a 10-digit number, listed below the model number.
What do some Goodman serial numbers decode to?
The first two rows are real serials from a Goodman bulletin, on packaged units, and the third is the example in Goodman’s warranty. The last two are made up to show the rule.
| Serial | Year | Month | Built |
|---|---|---|---|
1804165082 (from a Goodman bulletin) |
2018 | 04 | April 2018 (Goodman lists April 11) |
1812154656 (from a Goodman bulletin) |
2018 | 12 | December 2018 (Goodman lists December 11) |
Starts 2610 (Goodman’s warranty example) |
2026 | 10 | October 2026 |
2206123456 |
2022 | 06 | June 2022 |
1912345678 |
2019 | 12 | December 2019 |
How long do Goodman furnaces last?
Goodman doesn’t publish a typical life in years. For gas furnaces in general, the U.S. Department of Energy estimates an average life of 21.5 years. That’s an average across brands; any one furnace can last longer or shorter.
Common questions about Goodman furnace serial numbers
Do Goodman and Amana furnaces use the same serial format?
Yes, for current units. Goodman’s and Amana’s furnace warranty certificates both say the first four digits, year then month, are the manufacture date.
Does this work on an older Goodman or Amana furnace?
The Goodman documents we cite go back to 2018. Older furnaces, and Amana units from before Goodman owned the brand, may use a different format that Goodman doesn’t publish. Goodman’s customer support can date them from the model and serial number.
Why does the build date matter for the warranty?
Outside California, if the installation date can’t be verified, Goodman’s warranty treats the installation date as three months after the manufacture date in the serial number.