Goodman and Amana furnace and AC age by serial number

Reviewed 2026-10-152 primary sourcesSee sources

Goodman’s warranties spell out the date code: the first two digits of the serial are the year and the next two the month. Goodman uses that date to start the warranty when the installation date can’t be shown.

Covers: Goodman gas furnaces covered by Goodman’s furnace warranty (including GMSS96, GMEC96, GMVC96 and GMVM97 families) and Amana-brand packaged terminal units that use the same four-digit date code.

Where to find the serial number

• Goodman reads the date from the serial number printed on the unit.^[1]

Date formats Goodman documents

Year + monthserials that start with four digits

Goodman doesn’t say when this layout began or give the century; its example is from 2013, so we read the year as 20YY. A unit made before 2000 in an older layout would be misread.^[1]

What Goodman says

• If the installation date can’t be verified, Goodman treats the unit as installed three months after the manufacture date shown by the serial.^[1]
• Amana’s packaged terminal warranty prints the same year-and-month rule.^[2]

Worked examples

• 1306: The first four digits 1306 mean June 2013 (Goodman’s example). You can enter just those four digits.^[1]

What the serial can’t tell you

• Goodman doesn’t explain the characters after the first four or say which earlier formats it used.^[1]
• The serial gives the manufacture date only: not the installation date, the capacity or whether the warranty was registered.^[1]
• Amana’s packaged terminal warranty starts on the purchase date, not the manufacture date.^[2]
• Formats used by older Goodman, Janitrol and Amana equipment.
• Whether Daikin-brand equipment uses the same code (Daikin’s warranty documents were not reachable).