# Furnace age

**URL:** <https://forum.nachi.org/t/furnace-age/14445>\
**Category:** Inspecting HVAC Systems\
**Created:** [March 22, 2007, 11:30pm UTC](https://forum.nachi.org/t/furnace-age/14445 "2007-03-22T23:30:00Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![mguzanick](https://avatars.discourse-cdn.com/v4/letter/m/cc9497/32.png) [@mguzanick](https://forum.nachi.org/u/mguzanick)\
**Post date:** [March 22, 2007, 11:30pm UTC](https://forum.nachi.org/t/furnace-age/14445/1 "2007-03-22T23:30:00Z")

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Could someone help me determine the age of this furnace?  
HEIL  
Model#NUGK100AH02  
Serial#H619 67349  
Thanks

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**Author:** ![sstanczyk](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/sstanczyk/32/175851_2.png) [@sstanczyk](https://forum.nachi.org/u/sstanczyk)\
**Post date:** [March 22, 2007, 11:37pm UTC](https://forum.nachi.org/t/furnace-age/14445/2 "2007-03-22T23:37:57Z")

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1987 or 1988, and possibly 1985. Age of house?

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**Author:** ![rray](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/rray/32/2162_2.png) [@rray](https://forum.nachi.org/u/rray)\
**Post date:** [March 23, 2007, 7:15am UTC](https://forum.nachi.org/t/furnace-age/14445/3 "2007-03-23T07:15:37Z")

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I’m getting 1961.

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**Author:** ![tallen](https://avatars.discourse-cdn.com/v4/letter/t/f04885/32.png) [@tallen](https://forum.nachi.org/u/tallen)\
**Post date:** [March 23, 2007, 2:02pm UTC](https://forum.nachi.org/t/furnace-age/14445/4 "2007-03-23T14:02:37Z")

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Prestons says 1985, but, it is Prestons.:roll:

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**Author:** ![rray](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/rray/32/2162_2.png) [@rray](https://forum.nachi.org/u/rray)\
**Post date:** [March 23, 2007, 3:16pm UTC](https://forum.nachi.org/t/furnace-age/14445/5 "2007-03-23T15:16:50Z")

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I wonder if that “1985” might have been a “1965” in the original document before printing and is simply a typo that no one caught. Of course, I could also be wrong (but don’t tell anyone!).

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**Author:** ![dhadler](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/dhadler/32/1233_2.png) [@dhadler](https://forum.nachi.org/u/dhadler)\
**Post date:** [March 23, 2007, 3:24pm UTC](https://forum.nachi.org/t/furnace-age/14445/6 "2007-03-23T15:24:32Z")

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Michael, I usually figure out the age of those off the serial #…but it appears to be missing a digit in the first set of numbers?? Is that possible?

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**Author:** ![mlarson](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/mlarson/32/89225_2.png) [@mlarson](https://forum.nachi.org/u/mlarson)\
**Post date:** [March 23, 2007, 3:45pm UTC](https://forum.nachi.org/t/furnace-age/14445/7 "2007-03-23T15:45:45Z")

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The info I have is that  
L = mfg. plant location.  
next xxyy is xx=year, yy=week in year.  
next group of five is sequentional numbering for that week’s production

A number may be missing as Darrel states.