How Old Is My Trane Furnace?
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 from your furnace's data plate below.
Where the serial number is on a 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."
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.
Furnaces made before 1992 were built before the federal 78% efficiency minimum. If yours is that old, a new 95% furnace could cut your heating fuel use by a quarter or more.
Questions
How do I find the age of my Trane furnace?
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. You'll find the serial number on the data plate. 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."
How long does a Trane furnace last?
Like most furnaces, a Trane typically lasts 15 to 20 years with regular servicing.
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.
Related
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.