How old is my RunTru air conditioner?

Serial number age decoder for RunTru central air conditioners: 4 format eras, the decode rule in plain English, transcribed tables, and the official lookup.

• RunTru air conditioner serial numbers in the 2010 to present format encode the year as digits 1-2 (YY, 2010+) and the week as digits 3-4 (source: building-center.org).
• Example: serial 130313596L decodes to week 3 of 2013.
• RunTru air conditioner serial numbers in the 2002 to 2009 format encode the year as digit 1 = last digit of year (2002-2009) and the week as digits 2-3 (source: building-center.org).
• Example: serial 91531S41F decodes to week 15 of 2009.
• RunTru air conditioner serial numbers in the 1983 to 2001 format encode the year as letter 1 via table (table below) and the week as digits 2-3 (source: building-center.org).
• Example: serial F23456789 decodes to week 23 of 1991.
• RunTru's official lookup at runtruhvac.com returns warranty / registration lookup.

Format eras

• 2010 to present VERIFIED
  #########Adigits 1-2 (YY, 2010+)
• 2002 to 2009 VERIFIED
  #####A##Adigit 1 = last digit of year (2002-2009)
• 1983 to 2001 VERIFIED
  A########letter 1 via table: W=1983 X=1984 Y=1985 S=1986 B=1987 C=1988 D=1989 E=1990 F=1991 G=1992
• 1970 to 1990 VERIFIED
  A##A#####digits 2-3

How to read the serial

2010 to present formatVERIFIED

Shape #########A · example 130313596L · confidence high

Year

digits 1-2 (YY, 2010+)

Week or month

week = digits 3-4

Plant

remaining chars include plant/line and day-of-week; not published

Example: serial 130313596L decodes to week 3 of 2013.

Listed under Trane in the source; RunTru is named in that format's family and the corporate link is an estimate, not a checked fact.

2002 to 2009 formatVERIFIED

Shape #####A##A · example 91531S41F · confidence high

Year

digit 1 = last digit of year (2002-2009)

Week or month

week = digits 2-3

Plant

letter(s) later in string

Example: serial 91531S41F decodes to week 15 of 2009.

Listed under Trane in the source; RunTru is named in that format's family and the corporate link is an estimate, not a checked fact.

1983 to 2001 formatVERIFIED

Shape A######## · example F23456789 · confidence high

Year

letter 1 via table: W=1983 X=1984 Y=1985 S=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 Z=2001

Week or month

week = digits 2-3

Example: serial F23456789 decodes to week 23 of 1991.

Listed under Trane in the source; RunTru is named in that format's family and the corporate link is an estimate, not a checked fact.

1970 to 1990 formatVERIFIED

Shape A##A##### · example A92M07217 · confidence medium

Year

digits 2-3

Week or month

position 4 = month (1-12)

Plant

letter 1 = factory code

Listed under Trane in the source; RunTru is named in that format's family and the corporate link is an estimate, not a checked fact.

Where the data plate is on an air conditioner

On the outdoor condenser: a metal or foil plate on the side or back of the cabinet, often near the refrigerant line connections. Some brands repeat it inside the electrical access panel.

General guidance, not brand-specific: the owner's manual or the installer can point to the exact spot. See the data plate guide.

For scale only: the InterNACHI Standard Estimated Life Expectancy Chart for Homes lists Air Conditioner (central) at 7 to 15 years of expected service (nachi.org). That chart is a guideline, not a prediction for your unit.

What we could not confirm

• RunTru is treated as sharing Trane's format because the source lists it in that family; the corporate relationship itself is an estimate.
• The 1970 to 1990 format is documented but not decodable here: example A92M07217 does not decode with the derived engine.
• No building-center page. Parent sourced: tranetechnologies.com/en/index/brands.html lists RunTru ('designed, tested and assembled in the U.S.A.') and runtruhvac.com says 'backed by Trane' with a Trane copyright footer. Serial FORMAT is inferred from the parent only - no source decodes a RunTru serial.

Sources

• https://www.building-center.org/trane/
• img: Trane-Style-2-Chart-2022.jpg (transcribed)
• https://runtruhvac.com/warranty/official

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