Mitsubishi model numbers pack the series, capacity and configuration of the unit into one string. Once you know where to split it, a Mitsubishi model number tells you almost everything except the unit's age. This guide decodes Mitsubishi indoor and outdoor model numbers position by position, using the key the manufacturer prints on its product data sheets.
Mitsubishi is built by Mitsubishi Electric US (ductless / M-Series and P-Series). Mitsubishi residential model numbers are built for mini-splits and multi-splits, not gas furnaces. Indoor wall units use MSZ-*; matching outdoor units use MUZ-* (heat pump) or MUY-* (cooling-only on some lines). Capacity is almost always the two-digit kBTU code in the middle of the string.
Positions follow Mitsubishi Electric US M-Series naming as printed on product literature (MSZ/MUZ + series + kBTU + NA). Always confirm the indoor/outdoor pair is a factory-rated match.
Where to Find the Mitsubishi Model Number
On a furnace, the rating plate is inside the front door or on the side of the cabinet, usually a foil or paper label with the model (M/N) and serial (S/N) side by side. On an outdoor AC or heat pump it is on the side of the condenser near the refrigerant line connections. Copy the model number exactly as printed, including dashes: the position of each character is what carries the meaning.
Mitsubishi Indoor Unit Model Number Format
A typical Mitsubishi model number in this family looks like: MSZ-FS12NA. Use the table to split it up:
| Position | Characters | Meaning | Example |
|---|---|---|---|
| Product family | MSZ | MSZ = wall-mounted indoor; MFZ = floor; SEZ/PEAD = ducted indoor; PCA = ceiling cassette | MSZ (wall) |
| Series | FS | Series / feature family (FS = Hyper-Heating wall; GL / FH / GE on other generations) | FS |
| Capacity | 12 | Nominal thousands of BTU/h: 06, 09, 12, 15, 18, 24, 30, 36 (common M-Series sizes) | 12,000 BTU/h ≈ 1 ton |
| Region / voltage | NA | NA = North America 208/230 V single-phase residential | NA |
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Common Mitsubishi Families
The first few characters identify the family, and the family tells you the tier, staging and blower (or inverter class) before you read a single digit of capacity.
| Model prefix | Family | Stages | Blower | Efficiency |
|---|---|---|---|---|
| MSZ-FS / MUZ-FS | Hyper-Heating wall (M-Series) | Inverter | Variable-speed | High HSPF / cold-climate |
| MSZ-GL / MSZ-GE | Standard wall M-Series | Inverter | Variable-speed | Mid SEER class |
| SEZ / PEAD / SVZ | Ducted indoor + outdoor pairs | Inverter | Variable-speed | Hidden-duct applications |
| MXZ-* | Multi-zone outdoor | Inverter | Variable-speed | 2–8 indoor ports by model |
Mitsubishi Outdoor Unit Model Numbers
Outdoor units use a different string. A typical Mitsubishi outdoor model number looks like: MUZ-FS12NA.
| Position | Characters | Meaning | Example |
|---|---|---|---|
| Product family | MUZ | MUZ = heat-pump outdoor; MUY = cooling-only outdoor on some lines; MXZ = multi-zone outdoor | MUZ (HP) |
| Series | FS | Must match the indoor series for a rated pair (FS with FS, GL with GL, etc.) | FS |
| Capacity | 12 | Same kBTU code as the paired indoor unit | 12,000 BTU/h ≈ 1 ton |
| Region / voltage | NA | NA = North America residential | NA |
Mitsubishi Tonnage by Model Number
Mitsubishi prints capacity as a two-digit kBTU code (09, 12, 18…), not always as 018/024/036. Divide kBTU by 12 for tons (12 = 1 ton, 18 = 1.5 ton, 24 = 2 ton, 36 = 3 ton). The 018–060 table below still applies when the label uses three-digit BTU coding on larger ducted / P-Series gear.
| Model code | Size | Cooling capacity |
|---|---|---|
| 018 | 1.5 ton | 18,000 BTU/h |
| 024 | 2 ton | 24,000 BTU/h |
| 030 | 2.5 ton | 30,000 BTU/h |
| 036 | 3 ton | 36,000 BTU/h |
| 042 | 3.5 ton | 42,000 BTU/h |
| 048 | 4 ton | 48,000 BTU/h |
| 060 | 5 ton | 60,000 BTU/h |
Common Mitsubishi outdoor families and where they sit:
| Model prefix | Family | Efficiency |
|---|---|---|
| MUZ-FS / MUZ-GL | Single-zone heat-pump outdoor | Paired to matching MSZ indoor |
| MXZ-2C / MXZ-3C / MXZ-4C… | Multi-zone outdoor | Total connected capacity in the model family |
| PUZ / PUY (P-Series) | Light commercial / larger ducted | Same kBTU coding habit |
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What the Mitsubishi Model Number Does Not Tell You
The model number says nothing about the unit's age. That is in the serial number, and Mitsubishi (like most brands) has changed serial date formats over the years. Use the Mitsubishi serial number lookup to turn a serial into a manufacture date, or the HVAC serial number decoder hub for any other brand. The model number also does not tell you whether the unit was installed and charged correctly, which matters as much as the SEER digit for what it actually costs to run.
Decoded Your Mitsubishi? Here Is What to Do With It
If the unit is under 10 years old and the model number shows a mid- or high-efficiency family, it is usually worth repairing. If the serial dates it past 12 to 15 years for an AC or 15 to 20 years for a furnace, the capacity and cabinet width you just decoded are exactly what you need to size a replacement. A new system at the same tonnage and input will drop straight into the same duct and gas connections.
Related: how to read any furnace data label · Goodman model number decoder.
Mitsubishi, and related marks, are trademarks of their respective owners. Furnace Direct is not affiliated with or endorsed by Mitsubishi's manufacturer. This page is nominative fair-use reference for homeowners decoding a nameplate.
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