Goodman Model Number Lookup
Goodman model numbers are among the easiest to read. In GSX140361 the letters are the series, 14 is the SEER and 036 is the size, so it's a 3-ton air conditioner. Enter yours to decode it.
Part of the model number tools. To find the age instead, use the Goodman age lookup.
Model number size lookup
Where to find the Goodman model number
The model number is printed above the serial number on the rating plate: on the side of the outdoor unit, or inside the furnace blower door. It starts with letters (GSX, GSZ, GMVC, ASX, DX), unlike the all-digit Goodman serial number.
Air conditioners and heat pumps
| Part | Example (GSX140361) | Meaning |
|---|---|---|
| Letters | GSX | Brand and type: G = Goodman, S = split system, X = air conditioner (Z = heat pump) |
| 2 digits | 14 | SEER rating at the time of design |
| 3 digits | 036 | Nominal capacity in thousands of BTU/h |
| Last digit | 1 | Revision / electrical code |
| Model number | Size | Layout |
|---|---|---|
| GSX14 036 1 | 3 tons (36,000 BTU/h) | Series (3–4 letters) + SEER (2 digits) + capacity (3 digits) |
| GSZ14 048 1 | 4 tons (48,000 BTU/h) | Series (3–4 letters) + SEER (2 digits) + capacity (3 digits) |
| GSXC18 036 1 | 3 tons (36,000 BTU/h) | Series (3–4 letters) + SEER (2 digits) + capacity (3 digits) |
| ASX16 024 1 | 2 tons (24,000 BTU/h) | Series (3–4 letters) + SEER (2 digits) + capacity (3 digits) |
| DX16SA 060 1 | 5 tons (60,000 BTU/h) | Series + SEER + 2 letters + capacity (3 digits) |
| DZ16SA 042 1 | 3.5 tons (42,000 BTU/h) | Series + SEER + 2 letters + capacity (3 digits) |
Amana uses A instead of G (ASX, ASZ) and Daikin uses DX and DZ with two extra letters before the size (DX16SA0361). The size code works the same everywhere.
Furnaces
| Part | Example (GMVC960804CN) | Meaning |
|---|---|---|
| Letters | GMVC | Goodman two-stage, variable-speed furnace series |
| 2 digits | 96 | AFUE efficiency (%) |
| 3 digits | 080 | Input in thousands of BTU/h |
| 1 digit | 4 | Blower airflow, in tons of matched cooling |
| Letters | CN | Cabinet width and revision |
| Model number | Size | Layout |
|---|---|---|
| GMVC96 080 4CN | 80,000 BTU/h input (furnace) | Series + AFUE (2 digits) + input (3 digits) + airflow digit |
| GMEC96 060 3BN | 60,000 BTU/h input (furnace) | Series + AFUE (2 digits) + input (3 digits) + airflow digit |
| GMS8 080 5CN | 80,000 BTU/h input (furnace) | Series + input (3 digits) + airflow digit |
| AMVC96 100 5DN | 100,000 BTU/h input (furnace) | Series + AFUE (2 digits) + input (3 digits) + airflow digit |
| DM96VC 080 4CN | 80,000 BTU/h input (furnace) | DM + AFUE + 2 letters + input (3 digits) |
80% furnaces such as the GMS8 drop the efficiency digits into the series name, so GMS80805CN is an 80% furnace with 80,000 BTU/h input and a 5-ton blower.
The airflow digit is easy to miss
The single digit after a Goodman furnace’s input code tells you the largest air conditioner the blower is designed to move air for. A GMVC960603BN (60,000 BTU input, 3-ton airflow) paired with a 4-ton outdoor unit would starve the indoor coil of air: the system would freeze up, lose efficiency and wear the compressor. If you’re replacing only the outdoor unit with a bigger one, check this digit first.
What the SEER digits don’t tell you
The SEER in a Goodman model number is the series rating, which was the design target when the series launched. Actual efficiency depends on which indoor coil and furnace the outdoor unit is matched with, and since 2023 equipment is rated in SEER2, which uses a stricter test and gives lower numbers for the same equipment. The AHRI certificate for your exact combination has the real rating.
Frequently asked questions
How do I read the tonnage on a Goodman model number?
After the series letters and the two-digit SEER, the next three digits are the size in thousands of BTU per hour. GSX140361 is 036, which is 36,000 BTU/h, or 3 tons.
What do GSX and GSZ mean?
GSX is a Goodman split-system air conditioner and GSZ is a Goodman split-system heat pump. Amana and Daikin use similar prefixes such as ASX, ASZ, DX and DZ.
What does the last digit in a Goodman furnace model mean?
In GMVC960804CN, 080 is the input (80,000 BTU/h) and the 4 after it is the blower's airflow capacity, meaning it can support up to a 4-ton air conditioner.
Is 96 in a Goodman furnace model the efficiency?
Yes. The two digits after the series letters are the AFUE rating, so GMVC96 is a 96% efficient furnace and GMS8 an 80% furnace.