Day & Night®

How to determine the date of production/manufacture or age of Day & Night® HVAC Systems.

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

Parent Company:  International Combort Products (ICP). part of UTC Building & Industrial Systems,  a subsidiary company of United Technologies Corp.
Sister or similar Brands Include: Airquest® | Arcoaire® | Day & Night® | Dettson® | Heil® | ICP Commercial® | Keeprite® | Lincoln® | Tempstar®

Example serial number styles/formats found:

  • Style 1:    4006A17330
  • Style 2:    50304091

Style 1:   4006A17330

Description: Nine (9) character Serial number begins with four (4) numerical digits follow by a single letter and ends with five (5) numerical digits.
Week of manufacture is 1st-2nd characters.
Year of manufacture is 3rd-4th characters.

Style 2:   850304091

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

Page last updated: 29 March 2016