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:
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Style 1: 4006A17330
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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