Goodman Manufacturing · HVAC Manufacture Date
Goodman Serial Number Age Lookup
Find your Goodman furnace, AC & heat pump manufacture date.
Goodman (and its Janitrol heritage line) encodes the manufacturing year and month in the first four digits of standard 10-character serial numbers. Enter your serial number below for instant age decoding.
Goodman HVAC Date Decoder
Enter your Goodman serial number.
Locate the rating plate on your Goodman furnace, heat pump, or air conditioner to decode its production year and month.
Enter your Goodman serial number above
Type the serial number from your furnace or air conditioner data plate to reveal the manufacturing year, month, and equipment age.
How Goodman Encodes Age in Serial Numbers
On modern Goodman and Janitrol residential HVAC equipment, the serial number consists of 10 alphanumeric characters. The manufacture date is encoded in a 4-digit YYMM prefix (Year and Month):
Example: Serial Number 1806789012
- Digits 1 & 2 (
18): Year of manufacture (2018). - Digits 3 & 4 (
06): Month of manufacture (June). - Digits 5–10 (
789012): Individual production run sequence number.
Applicable HVAC Brands: This date decoding formula applies to Goodman-family heating and cooling equipment built at shared Daikin/Goodman manufacturing facilities, including Goodman, Janitrol, and Amana-brand HVAC furnaces, air conditioners, and heat pumps. For Amana HVAC specifically, see the dedicated Amana HVAC serial decoder.
Do not confuse Amana appliances with Amana HVAC: Amana-brand refrigerators, washers, and ranges are manufactured by Whirlpool and use a completely different serial format. Only Amana heating and cooling equipment shares the Goodman scheme above.
Older & Non-Standard Serials: Some pre-2000 Goodman units used dashed serial numbers (for example 96-90391), and certain packaged terminal air conditioners (PTAC) use a different date scheme (serials ending in P or D, such as 5FU5472618P). If your serial does not begin with four numeric digits, refer to the unit's original installation paperwork or the rating plate.
How to Read a Goodman Serial Number (Step by Step)
Reading a Goodman serial number by hand takes three steps. Work left to right across the first four digits of a standard 10-character serial — they carry the full manufacture date. Using the example serial 1402100045:
- Read digits 1 & 2 as the year.
14is the last two digits of the manufacture year — 2014. - Read digits 3 & 4 as the month.
02is the two-digit month — the second month, February. - Treat digits 5–10 as the production sequence.
100045is the individual unit's run number, not part of the date. Ignore it when dating the unit.
Result: serial 1402100045 decodes to February 2014. Subtract the manufacture year from the current year for the approximate equipment age — the decoder above does this automatically. If the first four characters of your serial are not all digits, your unit uses an older or non-standard scheme; see the note above on dashed and PTAC serials.
Goodman Serial Number Nomenclature: Full Breakdown
The full nomenclature of a standard 10-character Goodman serial number breaks into three positional blocks. Goodman uses a year-first date format (YYMM) — worth stressing because sister-brand and rival HVAC schemes order the pieces differently.
| Position | Meaning | Example (1402100045) |
|---|---|---|
| Characters 1–2 | Year of manufacture (last two digits of the year) | 14 → 2014 |
| Characters 3–4 | Month of manufacture (01–12) | 02 → February |
| Characters 5–10 | Production sequence number (not a date) | 100045 |
This YYMM order (year then month) is what separates the Goodman family from Carrier-family HVAC, which puts the manufacturing week first in a WWYY layout. Same four-digit date block, opposite reading order — so confirm which brand you hold before decoding. The Goodman scheme here also covers Amana-brand HVAC and Janitrol equipment built on the same lines.
Where to Find the Serial Number Plate on Goodman Equipment
Goodman Gas Furnaces & Air Handlers
The metallic data rating plate is typically mounted on the interior wall of the blower compartment, visible once the lower access panel or blower door is removed. On upflow furnaces it sits behind the removable front door; on horizontal installations check the side casing.
Goodman Central AC & Heat Pumps
On outdoor condenser and heat pump units, the rating plate is affixed to the exterior metal casing, usually near the service valve connections or the electrical control access panel. It lists the Model Number (M/N), Serial Number (S/N), electrical ratings, and factory refrigerant charge.
Goodman Furnace Lifespan & The 50% Rule
As a general industry rule of thumb (not a manufacturer guarantee), a residential Goodman gas furnace typically lasts 15 to 20 years, while outdoor Goodman condensers and heat pumps commonly last 10 to 15 years. Before deciding between repair and replacement, check whether any manufacturer parts warranty still applies — coverage terms and length depend on the specific model and registration status, so confirm what transferred with the unit.
How Does the 50% Rule Benchmark Older Goodman Systems?
A widely referenced HVAC economic benchmark, the 50% Rule, compares major component repair estimates against replacement costs. When a system is past the midpoint of its expected lifespan (over 10 years old) and a repair (inducer motor, gas valve, or heat exchanger) exceeds 50% of replacement, industry benchmarks categorize replacement as the more economical threshold. Check whether the failed part is still under Goodman's warranty first.
Compare 50% repair cost benchmarks →Goodman Serial Number: Common Questions
What does a Goodman serial number tell you?
On modern units it encodes the manufacture date — the year in the first two digits and the month in the next two. It does not encode tonnage, efficiency, or capacity; those come from the separate model number. Use the serial to date the unit and the model number to identify its specifications.
Where is the date code in a Goodman serial number?
The date code is the first four digits (YYMM). There is no separate stamped date code to hunt for — the beginning of the serial itself is the date.
My Goodman serial has a dash or extra letters — how do I read it?
Pre-2000 units (for example 96-90391) and some PTAC models (serials ending in P or D) use different schemes and may not begin with a four-digit date. For those, check the original installation paperwork or the rating plate rather than applying the YYMM rule.
Source & verification: Goodman does not publish a public homeowner-facing serial-date reference, so this decoder follows the widely corroborated Goodman/Amana HVAC date convention documented by the third-party industry reference Building Intelligence Center. Always confirm the reading against the physical serial (S/N) on your rating plate; the serial number is not the model number.
Disclaimer: This Goodman HVAC serial lookup is provided strictly as an informational manufacturing date reference. High-voltage electricity, gas valves, draft inducers, and heat exchangers pose severe safety and combustion risks. Never service gas or electrical components yourself; always consult a licensed and insured HVAC contractor.