Serial Number Age

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Coleman Serial Number: How Old Is My Coleman Furnace or AC?

Since late 2004, digits 2 and 4 of a York, Luxaire or Coleman serial number make the year and letter 3 is the month; older serials use two letters. Type the serial number below for the exact month and year.

Decode a Coleman serial number

Type it exactly as printed. Spaces and dashes don't matter.

About Coleman

Coleman home heating and cooling is made by Johnson Controls and uses the York code. This does not cover Coleman RV air conditioners or camping gear, which are different companies.

Same serial code: York, Luxaire.

By type: Coleman furnace age

Where to find the serial number

FURNACEMODEL NO.SERIAL NO.N0D6653823
The serial number is usually labelled "Serial No." Example in the Coleman format.

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 Coleman serial number

Since late 2004, digits 2 and 4 of a York, Luxaire or Coleman serial number make the year and letter 3 is the month; older serials use two letters.

Late 2004 to today

P Y M Y ######

  1. Character 1 is the factory.
  2. Characters 2 and 4 together are the year: W0D5… gives 0 and 5, so 2005.
  3. Character 3 is the month: A = January, B = February, C = March, D = April, E = May, F = June, G = July, H = August, K = September, L = October, M = November, N = December (no I or J).

Example: N0D6653823

1971 to 2004: 4 letters, then 6 digits

P M Y L ######

  1. Letter 2 is the month (same letters as above).
  2. Letter 3 is the year: A = 1971 or 1992, B = 1972 or 1993, C = 1973 or 1994, D = 1974 or 1995, E = 1975 or 1996, F = 1976 or 1997, G = 1977 or 1998, H = 1978 or 1999, J = 1979 or 2000, K = 1980 or 2001, L = 1981 or 2002, M = 1982 or 2003, N = 1983 or 2004, P = 1984, R = 1985, S = 1986, T = 1987, V = 1988, W = 1989, X = 1990, Y = 1991.
  3. Ignore a letter in brackets at the start, such as (S).

Example: WFKM003055

When one serial fits two dates: Year letters A to N were used twice, 21 years apart. Look for the ANSI standard year on the label, the style of the unit, or the age of the house. A 1970s unit is now over 45 years old and rare.

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 Coleman furnace is?

Find the serial number on the data plate and read it with the Coleman code: Since late 2004, digits 2 and 4 of a York, Luxaire or Coleman serial number make the year and letter 3 is the month; older serials use two letters. 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?

Year letters A to N were used twice, 21 years apart. Look for the ANSI standard year on the label, the style of the unit, or the age of the house. A 1970s unit is now over 45 years old and rare.

Who makes Coleman?

Coleman is made by Johnson Controls. The same serial code is used by York, Luxaire.

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