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How old is my Mitsubishi Electric furnace or AC?

Type the serial number from the Mitsubishi Electric label to see when it was built.

Reading a Mitsubishi Electric serial number

The first digit is the last digit of the year, and the second character is the month (X, Y and Z for October to December). The serial does not give the decade.

Check the refrigerant on the label. R-22 points to a unit built before 2010.

About Mitsubishi Electric

Since May 2018, Mitsubishi Electric Trane HVAC US, a 50-50 venture with Trane’s former parent Ingersoll Rand, sells Mitsubishi ductless units in the US.
The same units also carry the Trane / Mitsubishi Electric and American Standard / Mitsubishi Electric names.
The US business is based in Suwanee, Georgia.

Sources: Mitsubishi Electric Trane HVAC Now Serving Ductless Customers, Mitsubishi Electric Trane HVAC US LLC (New Equipment Digest)

Mitsubishi Thailand-built, year digit only

Used mini-splits, about 2000 to today. Example: 3002598T

Units built in Thailand have 7 digits followed by T, like 3002598T. The first digit is the last digit of the year. No month is given.

Worked example: 3002598T fits 1993 or 2003 or 2013 or 2023. The page above explains how to tell which.

Sources: McGarry and Madsen: Mitsubishi mini-split serial numbers, Building Intelligence Center: Mitsubishi, The Inspector’s Journal: Mitsubishi split age

Mitsubishi year digit and month character

Used mini-splits, about 2000 to today. Example: 89D00488D

The first digit is the last digit of the year and the second character is the month: 1 to 9, then X, Y and Z for October to December. The decade is not in the serial.

Worked example: 89D00488D fits September 1998 or September 2008 or September 2018. The page above explains how to tell which.

Month character (second character)
Character	Month
1	January
2	February
3	March
4	April
5	May
6	June
7	July
8	August
9	September
X	October
Y	November
Z	December

Sources: McGarry and Madsen: Mitsubishi mini-split serial numbers, Building Intelligence Center: Mitsubishi, The Inspector’s Journal: Mitsubishi split age

Standing at the unit? Use your phone

Point your phone’s camera at this code. The scanner opens and reads the label for you.

Formats on this page were last checked against their sources in October 2026. Mitsubishi Electric is a trademark of its owner. This page is independent and not affiliated with or endorsed by Mitsubishi Electric. For warranty questions, contact Mitsubishi Electric directly.

Where the serial is on a Mitsubishi Electric

On the indoor head, the label is on the side of the unit or under the front cover. On the outdoor unit, it is on a side panel.

Turn off the furnace switch before removing the front door. The outdoor unit’s plate is usually on the side panel near the electrical connections, sometimes on the back.