Day & Night HVAC Age Lookup by Serial Number
Decode your Day & Night serial number to find the manufacturing date, system age, and maintenance recommendations. Free and instant. No account needed.
Finding Your Day & Night Serial Number
Check these four spots on your HVAC system
Common Locations
What to Look For
- White or metallic manufacturer sticker
- Labeled "Serial No." or "S/N"
- Typically 8–12 characters long
- Usually near the model number
Can't find it? Try the electrical access panel on the front of the outdoor unit or inside the air handler cabinet.
Serial Number Examples
Don't worry if yours looks different — each brand has multiple formats and our system can decode most variations.
About Day & Night HVAC Systems
Day & Night is one of the older regional HVAC brand names. It predates ICP and was a standalone company before being absorbed into what eventually became the ICP family. Today it's sold primarily in western states through ICP's contractor network, a Carrier Global division. Day & Night systems share the same manufacturing base as Heil, Tempstar, Arcoaire, and the other ICP brands. The serial number format is consistent across all ICP brands: two-digit year in positions 2 and 3, manufacturing week in positions 4 and 5.
Supported Brands
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