# Age of York furnace

**URL:** <https://forum.nachi.org/t/age-of-york-furnace/40528>\
**Category:** Inspecting HVAC Systems\
**Created:** [July 21, 2009, 9:37pm UTC](https://forum.nachi.org/t/age-of-york-furnace/40528 "2009-07-21T21:37:48Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![bhartley](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/bhartley/32/1448_2.png) [@bhartley](https://forum.nachi.org/u/bhartley)\
**Post date:** [July 21, 2009, 9:37pm UTC](https://forum.nachi.org/t/age-of-york-furnace/40528/1 "2009-07-21T21:37:48Z")

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I need some help with the age of YORK furnace. Serial # WOL5030675. Model # GY8S080a12UH11B. I can not find it my PRESTON’S.

Thanks!!!

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**Author:** ![lkage](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/lkage/32/347658_2.png) [@lkage](https://forum.nachi.org/u/lkage)\
**Post date:** [July 21, 2009, 9:57pm UTC](https://forum.nachi.org/t/age-of-york-furnace/40528/2 "2009-07-21T21:57:51Z")

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> [@bhartley](#):
>
> I need some help with the age of YORK furnace. Serial # WOL5030675. Model # GY8S080a12UH11B. I can not find it my PRESTON’S.
> 
> Thanks!!!

Looks like 1981 or 2002.

**YORK** HVAC DATING (Unitary Products since 1984)  
Note: they skip the letters I, O, Q, U, Z.  
Year of make indicated by 3rd letter in the serial number.

1971 - A 1992 - A  
1972 - B 1993 - B  
1973 - C 1994 - C  
1974 - D 1995 - D  
1975 - E 1996 - E  
1976 - F 1997 - F  
1977 - G 1998 - G  
1978 - H 1999 - H  
1979 - J 2000 - J  
1980 - K 2001 - K  
1981 - L 2002 - L  
1982 – M 2003-M  
1983 – N 2004-N  
1984 – P 2005- P  
1985 - R  
1986 - S  
1987 - T  
1988 - V  
1989 - W  
1990 - X

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**Author:** ![bhartley](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/bhartley/32/1448_2.png) [@bhartley](https://forum.nachi.org/u/bhartley)\
**Post date:** [July 21, 2009, 10:05pm UTC](https://forum.nachi.org/t/age-of-york-furnace/40528/3 "2009-07-21T22:05:29Z")

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Thanks! Larry. The NEW AC was installed in 2007.

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**Author:** ![lkage](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/lkage/32/347658_2.png) [@lkage](https://forum.nachi.org/u/lkage)\
**Post date:** [July 21, 2009, 10:09pm UTC](https://forum.nachi.org/t/age-of-york-furnace/40528/4 "2009-07-21T22:09:21Z")

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> [@bhartley](#):
>
> Thanks! Larry. The NEW AC was installed in 2007.

Your welcome.

Probably 2002 then.