Trane Serial Number: How Old Is My Trane Furnace or AC?
Since 2010 the first two digits of a Trane serial number are the year and the next two are the week; older units use a single digit or a year letter. Type the serial number below for the exact month and year.
About Trane
Trane and American Standard come from the same factories and share a serial code. Trane has changed that code three times since 1983, so the first step is to see whether the serial starts with two digits, one digit or a letter.
Same serial code: American Standard, Ameristar.
By type: Trane furnace age · Trane air conditioner age
Where to find the serial number
Furnace: Take off the front lower panel (turn the power off first). The data plate is a metal or foil sticker on the inside of the door or on the side of the cabinet, next to the blower. The serial number is usually labelled "Serial No.", "S/N" or "Ser. No."
Air conditioner: On the outdoor unit (the condenser), look for the data plate on the side panel, often near the electrical box where the power cables go in. The indoor coil or air handler has its own plate with a different serial number.
How to read a Trane serial number
Since 2010 the first two digits of a Trane serial number are the year and the next two are the week; older units use a single digit or a year letter.
2010 to today: starts with 2 digits
YY WW # #####
- Digits 1 and 2 are the year: 17 means 2017.
- Digits 3 and 4 are the week of the year.
Example: 17103N6MF4
2002 to 2009: 9 characters, starts with 1 digit
Y WW ## L ###
- Digit 1 is the last digit of the year: 8 means 2008.
- Digits 2 and 3 are the week of the year.
Example: 81422S41G
1983 to 2001: starts with a letter
L WW ######
- The first letter is the year: W = 1983, X = 1984, Y = 1985, Z = 1986, B = 1987, C = 1988, D = 1989, E = 1990, F = 1991, G = 1992, H = 1993, J = 1994, K = 1995, L = 1996, M = 1997, N = 1998, P = 1999, R = 2000, S = 2001.
- The next two digits are the week of the year.
Example: J1828DWCD
When one serial fits two dates: Published guides disagree about two of the 1983 to 2001 letters: one says S = 2001 and Z = 1986, another has them the other way round, so we show both. Some older serials also fit two formats; the age of the house usually settles it.
Codes from the 1970s and early 1980s (short serials with hyphens) are not decoded yet.
How long does a furnace last?
Most furnaces last 15 to 20 years. Yearly servicing, the local climate and how hard it works all move it within that range. Past 15 years, it is worth getting a replacement price before the unit fails, so you aren't forced into a rushed decision.
Questions
How do I tell how old my Trane furnace is?
Find the serial number on the data plate and read it with the Trane code: Since 2010 the first two digits of a Trane serial number are the year and the next two are the week; older units use a single digit or a year letter. Or type it into the decoder on this page.
Is the manufacture date printed on the label?
Often, yes, especially on newer units and water heaters. Look for "Mfg. date", "MFD" or "Date of manufacture". If there is a printed date, it is more reliable than decoding the serial number.
Why does my serial number give two possible dates?
Published guides disagree about two of the 1983 to 2001 letters: one says S = 2001 and Z = 1986, another has them the other way round, so we show both. Some older serials also fit two formats; the age of the house usually settles it.
Who makes Trane?
Trane is made by Trane Technologies. The same serial code is used by American Standard, Ameristar.
How sure are these dates? Checked against official records (recall notices or data plates with printed dates). How we test the decoder.
Keeping an older furnace going
- Furnace air filter: Change it every 1 to 3 months. Check the size printed on the old filter.
- Carbon monoxide detector plug in: Any gas furnace, and especially an older one, should have a CO alarm nearby.
- Smart thermostat: Cuts run time on any system, old or new.