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

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

Parent Company:  Goodman

Example serial number styles/formats found:

  • Style 1: 850304091

Style 1:   850304091

Description: Nine (9) character Serial number.
Year of manufacture is 1st- 2nd numerical digits
Month of manufacture is 3rd – 4th numerical digits

Page last updated: 14 Sep 2015

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2000 Consolidated Recall

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