Lennox®

How to determine the date of production/manufacture or age of Lennox® HVAC Systems.

The date of production/manufacture or age of Lennox® HVAC equipment can be determined from the serial number located on the data plate.

Sister or similar Brands Include: AirEase® | Airease-Johnson® | Aire-flo® | Allied-Commercial® | Armstrong Air® | Concord® | Ducane® | Lennox® | Magic-Pak®

Example serial number styles/formats found:

  • Style 1:     1606B13871 or5899L 17212
  • Style 2:     C89274AAC
  • Style 3:     15A67 JA098
  • Style 4:     4140720328

Style 1:  1606B13871 or 5899L 17212

Description: Ten (10) character Serial number begins with four (4) numerical digits followed by one (1) letter and ends with five (5) numerical digits.
Year of manufacture is 3rd-4th character numerical digits
Month of manufacture is 5th character letter digit (See chart below).

Style 2:   C89274AAC

Description: Nine (9) character Serial number begins with one (1) letter digit followed by five (5) numerical digits and ends with three (3) letter digits.
Year of manufacture is 1st-2nd numerical digits
Month of manufacture is 3rd character (see chart)

Style 3:   15A67 JA098

Description:  Ten (10) character Serial number begins with two (2) numerical digits followed by a letter and two (2) more numerical digits – a space – and ends with two (2) letters followed by three (3) numerical digits
Day of manufacture is 1st-2nd numerical digits
Month of manufacture is 3rd character letter digit (See chart below)
Year of manufacture is 4th-5th numerical digits reversed.

Style 4:   4140720328

Description:  Ten (10) digit numerical Serial number.
Year of manufacture is 7th-8th numerical digits.
Work Week of manufacture is 9th-10th numerical digits.

Help keep this site FREE to the public.

Please consider a single donation of $5, $10, $20, $50 or more…

Or join some of our generous donors who provide $2 to $10 automatic monthly donations!
Any amount will help and greatly appreciated to help us maintain this site for your use!

Page last updated: 6 June 2018