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  1. #1
    Join Date
    Oct 2005
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    I searched this forum for the keyword "age" and couldn't find a description of how to determine the age of my system. I have a Lennox furnace but don't have the model and serial # handy. It may be approaching 20 years old, but how can I learn what year it was manufactured? I bought the house in 2001, and the sellers said they thought it might be 13-14 then, but they'd only lived there 4 years. Thanks.

  2. #2
    Join Date
    Mar 2005
    burlington county n.j.
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    date code is in the serial# 3rd +4th numbers the year, letter is the month.

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