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Trane · American Standard

How Old Is My
Trane or American Standard?

How do I read a Trane serial number?

Trane and American Standard serials made since 2010 are ten characters, and the first four digits are the year, then the week: 130313596L was built in week 3 of 2013. From 2002 to 2009 serials are nine characters: the first digit is the year and the next two the week. Older serials start with a letter.

By Jason Strauss, founder of Answer3 · Updated October 20, 2026

Trane Serial Number Decoder

How to Read the Serial Number

  1. Find the data plate on the outdoor unit's side panel, or inside the furnace or air handler door.
  2. Count the characters in the serial.
  3. 10 characters (2010 and later): digits 1–2 = year, digits 3–4 = week.
  4. 9 characters (2002–2009): digit 1 = the last digit of the year, digits 2–3 = week.
  5. Starts with a letter: the older format used before 2002.
SerialBuilt
130313596LWeek 3 of 2013 (mid-January 2013)
722112345 (9 characters)Week 22 of 2007 (late May 2007)

If the serial starts with a letter, the unit was made before 2002 under Trane's older code, which makes it more than 20 years old.

Codes based on a week number give the month only approximately. If the plate prints a manufacture date (often labeled MFG or MFD), trust that over the serial.

How Long Does It Last?

EquipmentTypical service life
Gas furnace15–25 years
Central air conditioner7–15 years
Heat pump10–15 years

Source: InterNACHI Standard Estimated Life Expectancy Chart. Maintenance, water quality and climate all move these numbers.

Age doesn't mean a unit has to be replaced; it tells you when to start planning. A replacement you schedule costs less than one you buy the night it fails. If it's near the end of its range, write down the model, serial and capacity now, so a contractor can quote the right replacement without a trip just to read the plate.

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Scan the nameplate and Answer3 Vault reads the serial, works out the age, saves the model and the maker's parts list, and reminds you before the unit reaches the end of its life.

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Trane Age FAQ

Does American Standard use the same serial format as Trane?
Yes. American Standard residential equipment is built by Trane and uses the same serial format.
Why is my Trane serial only nine characters?
Nine-character serials are from 2002 to 2009. The first digit is the last digit of the year and the next two are the week.
My Trane serial starts with a letter. How old is it?
Serials that start with a letter are Trane's older format, used before 2002, so the unit is more than 20 years old. Check the plate for a printed date.
Related Guides: Every brand: serial age decoder Carrier Furnace or AC age Lennox Furnace or AC age Goodman or Amana Unit age
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