Trane HVAC Age: Serial Number Decoding for AC, Furnace & Heat Pump

Trane age of unit – here is how to read a Trane serial number:

For units made from 2002 to 2009, the first number represents the year: 2 is 2002, 3 is 2003, etc. The next two numbers are the week of the year, so 01 would be the first week in January, and 52 would be the last week in December.

Starting in 2010, the first two numbers are the year and the second two are the week.

These numbers were used on air conditioners, heat pumps and furnaces plus other Trane equipment.

Here are examples:

2002 to 2009: 9-character serial number 81422S41G

8 is the year – 2008. 14 is the week – Sometime in April

Manufacture date: April 2008

2010 to Present: 10-character serial number 11241KADBB

11 is the year – 2011. 24 is the week – June

Manufacture date: June 2011

40+ years of Trane serial numbers: This page explains or decodes seven Trane serial number styles, making the date lookup very easy for any year going back to the 1970s. The numbers were/are used on ACs, heat pumps, furnaces, air handlers and other equipment types.

Not Model #s: This post is about Trane serial numbers, not Trane model numbers that have nomenclature related to the series, size and performance of the Trane AC, heat pump, furnace or other equipment.

Where is the Trane Serial Number?

It is on a metallic tag or label attached to the outside of the cabinet or cover of the AC, heat pump or furnace. Occasionally it will be inside a furnace cabinet, and you’ll need to remove the cover to find it.

This is what a Trane data tag or date plate looks like.

MFR Date: Trane makes it easy on many of its products by stamping the manufacture date right onto the tag. In the picture above, you can see it shown as 3/2017, or March 2017.

It proves the decoding method explained above. The serial number is 17103N6MF4.

The first two numbers are the year: 2017

The next two numbers are the week: The 10th week of the year falls in March.

MFR Date: 3/2017, just as the tag shows.

How to Read a Trane Air Conditioner Serial Number

This method is used for heat pump and furnace serial numbers too.

Here’s an overview of all the styles, including a review of the two explained already, now that you understand the basic strategy Trane uses. They are listed from most recent to older serial number styles.

For each of these, the important characters for the manufacturing date are underlined. The other numbers and letters in each of the styles identify the factory where the unit was made and the sequence of manufacturing.

10 Characters – 2010 to Present

Year: First two numbers are the year, starting with 10 (2010) and currently up to 22 (2022)

Week: Second two numbers from 01 to 52

Example: 11241KADBB

Manufacture Date: 2011, 24th week.

9 Characters – 2002 to 2009

Year: First number, 2 through 9 for 2002 through 2009.

Week: Second two numbers

Example: 81422S41G

Manufacture Date: 2008, 14th week.

9 Characters Starting with a Letter – 1983 to 2001

These serial numbers always begin with a letter followed by at least 2 numbers, but often more.

Year: Represented by the capital letter that starts the sequence.

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.

Skipped Letters: Note that I (i) and O (o) are skipped because they can be mistaken for numbers 1 and 0. We don’t know why Q was skipped – perhaps its resemblance to O/0. A is also not used.

During this period, the manufacturer date was often stamped on the tag to avoid confusion.

Week: First two numbers.

Example: J1828DWCD

Manufacture Date: 1994, 18th week.

7 Characters – 6 Numbers and 1 Letter – 1980 to 1982

This method wasn’t used long because it isn’t very clear. The letter could be at the beginning or end of the sequence.

Year: The letter refers to the year.

A or O = 1980 / B or T = 1981 / C or U = 1982

Week: N/A – The serial number does not include information about the week or month – just the year.

Example: T442951

Manufacture Date: 1981

10 Characters Starting with a Letter – 1980 to 1982

As you can see, Trane was working with a few systems in the early 1980s before making its serial numbers more uniform.

This system can be identified by the starting letter and by a letter in the 3rd spot from the end.

Year: The letter in the 3rd position from the end is the year. And it is coded.

A, L & O = 1980 / B, M & T = 1981 / C, N & U = 1982

Week: The last 2 characters are numbers. They are the week of the year.

Example: H289476C33

Date of Manufacture: 1982 (the letter C) in the 33rd week (August/September).

9 Characters Starting with a Letter – 1970s

This system was mostly used in the 1970s, but it “pops up” periodically after that on some types of Trane and American Standard equipment.

As you can guess, this sequence of numbers and letters can easily be confused with the method used from 1983 to 2001. But confusion is avoided if you understand the nomenclature sequence – Letter, 2 numbers, letter, etc. It’s the second through fourth characters that are essential to the manufacturing date.

*The starting letter is the code for the manufacturing facility where the unit was made, i.e., the factory code. Most codes of this type start with A or C.

Year: First two numbers after the letter.

Month: Week codes are not used – just months. The fourth character is a letter representing the month.

A=January / B=February / C=March / D=April / E=May / F=June / G=July / H=August / J=September / K=October / L=November / M=December

I (i) is skipped to avoid confusion with the number 1.

Example: C94L14723

Date of Manufacture: 1994 in November.

6 or 8 Character Hyphenated Codes – 1970 to 1979, 1990s

Let’s look at these similar styles one at a time.

6-character serial numbers began with a number and letter followed by a hyphen and then four more numbers.

Year: The starting number represents the year.

1=1971 / 2=1972 / 3=1973 and so forth.

Month: Weeks aren’t used in this code either, just the month.

A=January / B=February / C=March / D=April / E=May / F=June / G=July / H=August / J=September / K=October / L=November / M=December

I (i) is skipped to avoid confusion with the number 1.

Example: 5A-2294

Date of Manufacture: 5=1975, A=January, so January 1975.

8-character serial numbers began with a letter and two numbers followed by a hyphen and then five numbers.

Year: The second and third characters are the year.

Month: The beginning letter represents the month:

A=January / B=February / C=March / D=April / E=May / F=June / G=July / H=August / J=September / K=October / L=November / M=December

I (i) is skipped to avoid confusion with the number 1.

Example: K77-74592

Date of Manufacture: K=October, 77=1977, so October 1977

Written by

Rene has worked 10 years in the HVAC field and now is the Senior Comfort Specialist for PICKHVAC. He holds an HVAC associate degree from Lone Star College and EPA & R-410A Certifications.

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