HVAC Age by Serial Number
Pick the brand, type the serial number from the data plate, and get the manufacture date and the unit's age.
Formats this tool reads
| Brand | Format | Example |
|---|---|---|
| Carrier, Bryant, Payne, Day & Night | First 4 digits: week, then year (WWYY) | 4006… → week 40 of 2006 |
| Goodman, Amana, Daikin (residential) | First 4 digits: year, then month (YYMM) | 1609… → September 2016 |
| Trane, American Standard (2010+) | First 4 digits: year, then week (YYWW) | 1124… → week 24 of 2011 |
| Trane, American Standard (2002–2009) | First 3 digits: last digit of year, then week (YWW) | 814… → week 14 of 2008 |
| Lennox | Digits 3–4 are the year | 5205… → 2005 |
When a serial fits more than one era (some Trane serials do), the tool shows every possible date. Use the refrigerant and efficiency rating on the data plate to pick the right one: R-22 points to older equipment.
Rheem, Ruud, York and others
These brands have used several serial styles over the years, so the tool doesn't guess. For Rheem and Ruud, use Rheem's own age lookup or its warranty lookup. Many newer data plates print the manufacture date outright, so look for that first.
Before you quote the age
- Manufacture date isn't install date. Units can sit in a warehouse for months.
- Decode the indoor and outdoor units separately; a newer condenser on an old coil is common.
- Warranty depends on registration and the manufacturer's terms. Check with the manufacturer using the serial number.
More detail, including what the age means on a service call: how to tell HVAC age from the serial number. Need the size too? See tonnage from the model number.
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Results are estimates for field reference. Always confirm against the equipment manufacturer's charging chart, installation instructions and local code. Found a problem with this tool? Tell us.