Goodman, Amana and Daikin residential furnaces, air conditioners and heat pumps built since Daikin's 2012 acquisition of Goodman share the simplest serial format among the major HVAC brands covered on this site: the first four digits of the serial number are the manufacture date itself, written as two-digit year followed by two-digit month. A serial beginning 2205 was built in May of 2022, and a serial beginning 2307 was built in July of 2023.
Goodman's own support page confirms that the serial number identifies when the unit was produced, and an independent HVAC-trade reference states the year-then-month reading with a worked example. Older Goodman-brand units made before the Daikin acquisition sometimes used a letter-prefixed week-and-year format instead, which independent HVAC-trade sources describe with less consistency, so that earlier format is not covered here with the same confidence as the current one.
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Decode your own serial number
What this covers
- Goodman, Amana and Daikin residential furnaces, air conditioners and heat pumps built since approximately 2012
- Reading the two-digit year and two-digit month directly from the serial's first four digits, in that order
- Equipment sharing Daikin's post-acquisition serial numbering across all three brand names
What it does not cover
- ×Goodman-brand equipment made before the 2012 Daikin acquisition, which sometimes used a different letter-prefixed format not verified with the same confidence
- ×A guarantee that every Daikin-branded commercial or light-commercial product line uses this exact residential format
- ×The model number, which is a separate field encoding capacity and configuration
Try in this order
0 of 4 completedLocate the rating plate
ReversibleCheck the inner cabinet wall of the furnace or air handler, or the exterior panel of an outdoor condenser or heat pump.
Read the first two digits as the year
ReversibleThese are the two-digit year of manufacture.
Read the next two digits as the month
ReversibleThese are the two-digit month, 01 through 12. A serial starting 2205 means May 2022.
Treat a pre-2012 letter-prefixed serial as unverified here
ReversibleIf the serial starts with a letter rather than four digits, it likely predates the Daikin acquisition and this page's rule does not apply with the same confidence.
Evidence ledger
Sources behind this answer
Where the manufacturer's article stops. Goodman's own page confirms the serial identifies production timing but does not itself publish the exact YYMM digit order. That exact reading, and the worked example used above, comes from the independent source cited alongside it.
Official Goodman page confirming the ten-digit serial number "helps us identify the time the unit was produced"; it does not itself state the exact YYMM digit order, which comes from the independent source below. Verified Sept. 10, 2026.
Independent reference stating the exact reading used below — the first four digits are year then month (example: 1806123456 = June 2018) — for current Goodman, Amana and Daikin-branded residential equipment. Verified Sept. 10, 2026.
Exact questions
Questions about Decode a Goodman, Amana or Daikin serial number
Does this rule also work for Amana- and Daikin-branded units?+
Yes, for current production — Amana and Daikin residential ducted equipment share Goodman's manufacturing and the same post-2012 YYMM serial numbering.
How do I know if my Goodman unit predates the 2012 Daikin acquisition?+
A serial that opens with a letter rather than four digits is a sign of the older format, which this page does not decode with the same confidence.
Is YYMM confirmed directly by Goodman's own page?+
Goodman's own page confirms the serial encodes production timing but does not spell out the exact digit order in consumer-facing text, which is why this page cites an independent source for the precise YYMM reading.
Where do I find the Goodman, Amana or Daikin unit serial number?+
Look for the rating plate or label on the unit, on the outdoor or indoor unit's data plate. Photograph it before you start, since the label can be hard to read once the appliance is installed.