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How Old Is My Trane Air Conditioner?
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 air conditioner's data plate below.
Where the serial number is on a 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 air conditioner last?
Most air conditioners last 12 to 17 years. Yearly servicing, the local climate and how hard it works all move it within that range. Past 12 years, it is worth getting a replacement price before the unit fails, so you aren't forced into a rushed decision.
Air conditioners made before 2010 almost always use R-22 refrigerant, which is no longer produced in the US. If an older unit leaks, replacing it is often cheaper than recharging it.
Questions
How do I find the age of my Trane air conditioner?
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. 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 long does a Trane air conditioner last?
Like most air conditioners, a Trane typically lasts 12 to 17 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 air conditioner going
- Ac condenser coil cleaner: Dirty outdoor coils make an older unit work harder.
- Furnace air filter: The indoor filter matters for cooling too.
- Smart thermostat: Cuts run time on any system, old or new.