Your Goodman serial number contains everything you need to determine when your air conditioner, heat pump, or furnace was manufactured. Knowing the age of your unit is critical for warranty claims, planning replacements, and understanding how much life is left in your system. This guide walks you through exactly how to find, read, and decode any Goodman serial number — including units made under the Amana HVAC and Janitrol brands.
Goodman Manufacturing has been one of the most widely installed HVAC brands in the United States since its founding in 1982. In 2012, Daikin Industries — the world’s largest HVAC manufacturer — acquired Goodman, bringing improved engineering and quality control while keeping the brand’s value-focused pricing. Today, Goodman units are manufactured at a massive facility in Houston, Texas, alongside their sister brand Amana HVAC.
Use Our Free Goodman Serial Number Decoder
The fastest way to look up your Goodman serial number is our Free HVAC Age Decoder. Select “Goodman” from the brand list, enter your serial number, and instantly get the manufacture date, system age, and estimated remaining lifespan. The tool supports Goodman, Amana HVAC, and Janitrol units automatically.
If you prefer to decode it manually, keep reading.
Where to Find Your Goodman Serial Number
Every Goodman HVAC unit has a data plate (also called a rating plate or nameplate) that lists the model number, serial number, refrigerant type, and electrical specifications. The location depends on your unit type:
Outdoor Units (Air Conditioner or Heat Pump)
- Look on the side panel of the condenser, near the refrigerant service valves or electrical disconnect
- The data plate is typically a metal tag or adhesive label attached to the exterior cabinet
- On some older units, the plate may be behind the access panel — you may need to remove a couple of screws
Indoor Units (Furnace or Air Handler)
- Open the front panel or remove the blower compartment door
- The data plate is usually on the inside of the cabinet wall, visible once the panel is removed
- On horizontal furnaces installed in attics, the plate may be on the underside of the unit
Package Units
- Look on the exterior panel, typically on the side near the electrical connections
- Package units combine heating and cooling in a single outdoor cabinet, so there is only one data plate
What the Data Plate Looks Like
The plate lists several numbers. The two you need are:
- Model Number (M/N or MOD): Tells you the product line, tonnage, and efficiency
- Serial Number (S/N or SER): Tells you when the unit was manufactured
Write both down. You will need the model number for tonnage and warranty lookups, and the serial number for age decoding.
How to Decode a Goodman Serial Number
Goodman uses one of the most straightforward serial number formats in the HVAC industry. The manufacture date is encoded in the first four digits using a simple year-month (YYMM) pattern.
The Format
| Position | Digits | Meaning |
|---|---|---|
| 1-2 | Two digits | Year of manufacture (YY) |
| 3-4 | Two digits | Month of manufacture (MM, 01-12) |
| 5+ | Remaining digits | Production sequence number |
Step-by-Step Example
Let’s decode the serial number 1406123456:
- First 2 digits: 14 — This is the year. 14 = 2014
- Next 2 digits: 06 — This is the month. 06 = June
- Remaining digits: 123456 — This is the production sequence number (not relevant to age)
Result: This unit was manufactured in June 2014, making it approximately 11 years old as of 2026.
Another Example
Serial number 2103087654:
- First 2 digits: 21 — Year = 2021
- Next 2 digits: 03 — Month = March
- Result: Manufactured March 2021 — approximately 5 years old
Does Amana HVAC Use the Same Serial Number Format?
Yes. Amana HVAC units are manufactured by Goodman at the same Houston, Texas facility and use the identical YYMM serial number format. If you have an Amana-branded air conditioner, heat pump, or furnace, decode the serial number exactly the same way. The same applies to older Janitrol-branded units, which were a Goodman product line.
Our HVAC Age Decoder recognizes all three brands automatically.
How to Find Tonnage from a Goodman Model Number
Your Goodman model number also encodes the unit’s cooling capacity in tons. The tonnage is embedded as a two- or three-digit number within the model number that represents thousands of BTU per hour. Divide that number by 12 to get tons.
Common Goodman Tonnage Codes
| Code in Model # | BTU/h | Tons |
|---|---|---|
| 18 | 18,000 | 1.5 |
| 24 | 24,000 | 2.0 |
| 30 | 30,000 | 2.5 |
| 36 | 36,000 | 3.0 |
| 42 | 42,000 | 3.5 |
| 48 | 48,000 | 4.0 |
| 60 | 60,000 | 5.0 |
Example
Model number GSX140361: The digits 036 (or just 36) represent 36,000 BTU/h, which is a 3-ton unit. On newer models like GSXC703010, the 30 indicates 30,000 BTU/h or 2.5 tons.
The tonnage code is typically found after the series designation letters and the efficiency digits. If you are unsure, our HVAC Age Decoder extracts tonnage automatically from Goodman model numbers.
Goodman Product Lines (2026)
Goodman offers several tiers of equipment. Here are the current central air conditioner and heat pump lines:
Air Conditioners
| Series | Tier | SEER2 Rating | Compressor | Key Feature |
|---|---|---|---|---|
| GSXC7 | Premium | Up to 19 SEER2 | Variable-speed | ComfortBridge communicating system |
| GSXH5 | Mid-Range | Up to 17 SEER2 | Two-stage | Quiet operation, solid efficiency |
| GSX14 | Standard | Up to 15 SEER2 | Single-stage | Budget-friendly, reliable workhorse |
| GSX13 | Entry | 13-14 SEER2 | Single-stage | Lowest upfront cost |
Heat Pumps
| Series | Tier | SEER2 Rating | HSPF2 | Key Feature |
|---|---|---|---|---|
| GSZC7 | Premium | Up to 19 SEER2 | Up to 10 HSPF2 | Variable-speed, communicating |
| GSZH5 | Mid-Range | Up to 17 SEER2 | Up to 9.5 HSPF2 | Two-stage heating and cooling |
| GSZB4 | Standard | Up to 15 SEER2 | Up to 8.5 HSPF2 | Single-stage, value option |
All Goodman units ship with R-410A refrigerant, though newer models are transitioning to R-454B in compliance with the AIM Act phase-down schedule.
Goodman Warranty Lookup
Goodman offers one of the strongest warranties in the value-tier HVAC market. Here is what you need to know:
Standard Warranty (Unregistered)
If the unit is not registered within 60 days of installation, the warranty defaults to:
- 5 years on the compressor
- 5 years on parts
Registered Warranty
If registered within 60 days of installation through Goodman’s website, you receive:
- Lifetime compressor warranty (select models — most units with scroll compressors qualify)
- 10 years on all functional parts
- 10 years on the heat exchanger (furnaces)
How to Check Your Goodman Warranty Status
- Go to Goodman’s consumer portal at goodmanmfg.com
- Navigate to the warranty section and enter your model number and serial number
- The system will confirm the registration date, warranty coverage, and expiration
Important Warranty Notes
- The lifetime compressor warranty applies to the original homeowner only and is non-transferable
- Installation must be performed by a licensed HVAC contractor
- Proof of proper maintenance may be required for warranty claims
- Amana HVAC products carry the same warranty terms — they are registered through Goodman’s system
If you are buying a home with a Goodman system, check whether the warranty was registered. An unregistered unit more than 5 years old has no remaining manufacturer warranty coverage.
When to Replace Your Goodman System
Knowing your unit’s age helps you decide whether to repair or replace. Here are the general guidelines:
Expected Lifespans
| Equipment | Typical Lifespan |
|---|---|
| Central air conditioner | 15-20 years |
| Heat pump | 12-17 years |
| Gas furnace | 18-25 years |
| Air handler | 15-20 years |
Signs It Is Time to Replace
- Age exceeds 15 years for an AC or heat pump
- Repair costs exceed 50% of the price of a new unit
- R-22 refrigerant — Goodman used R-22 in units manufactured before 2010. R-22 is no longer produced and extremely expensive to recharge
- Frequent breakdowns — more than two repairs per cooling season
- SEER rating below 13 — upgrading to a modern 15+ SEER2 unit can cut cooling costs by 20-40%
- The compressor has failed and the unit is out of warranty
If your Goodman system was manufactured before 2010, it uses R-22 and is at least 16 years old. Replacement is almost always more cost-effective than continued repairs at that point.
For a detailed brand comparison to help you choose a replacement, read our Goodman vs Rheem comparison.
Frequently Asked Questions
How do I find the age of my Goodman air conditioner?
Look at the first four digits of the serial number. The first two digits are the year, and the next two are the month. For example, a serial starting with 1906 means the unit was manufactured in June 2019. You can also use our free HVAC Age Decoder to decode it instantly.
Does Amana HVAC use the same serial number format as Goodman?
Yes. Amana HVAC equipment is manufactured by Goodman at the same facility in Houston, Texas. Both brands use the identical YYMM serial number format. If you have an Amana air conditioner, heat pump, or furnace, decode the serial number the same way you would a Goodman unit.
Where is the serial number on a Goodman outdoor unit?
The serial number is printed on the data plate, which is typically located on the side panel of the outdoor condenser near the refrigerant service valves or electrical disconnect. It may be a metal tag or an adhesive label. On older units, you may need to remove the access panel to see it.
Does Goodman really offer a lifetime compressor warranty?
Yes, but only under specific conditions. The unit must be registered within 60 days of installation, installed by a licensed contractor, and the warranty applies only to the original homeowner. It is also limited to select models with scroll compressors. Unregistered units default to a 5-year compressor warranty.
How many tons is my Goodman AC?
Look at the model number for a two- or three-digit code representing BTU output in thousands. Common codes: 24 = 2 tons, 30 = 2.5 tons, 36 = 3 tons, 48 = 4 tons, 60 = 5 tons. Divide the number by 12 to calculate tonnage. Our HVAC Age Decoder also extracts tonnage from Goodman model numbers automatically.
Need Help With Your Goodman System?
If your Goodman unit is aging, underperforming, or in need of repair, we can help. Texas Temp Masters services all Goodman, Amana, and Daikin equipment across Central Texas.
Call us at (817) 704-0706 for a free assessment.
Helpful resources:
- Free HVAC Age Decoder — Decode any Goodman, Amana, or Janitrol serial number instantly
- Goodman vs Rheem Comparison — Choosing between the two most popular value brands
- How to Read Any HVAC Serial Number — Covers 22+ brands including Carrier, Trane, Lennox, and more
- How Long Does an AC Last? — Lifespan expectations and replacement timing
