SYSTEM AGE CHECK
How old is your HVAC equipment?
Use the rating plate—not appearance—to screen a likely manufacture date. Because serial conventions change, every result shows its confidence and official verification route.
Check my serial →FIND THE RIGHT LABEL
Model, serial and installation date are different facts.
Outdoor AC and heat-pump rating plates are commonly near service connections. Furnace and air-handler labels are commonly inside or behind a service panel. Turn equipment off and follow manufacturer instructions before opening any removable panel.
- Photograph the entire label before typing.
- Keep indoor and outdoor serials separate.
- A manufacture date does not prove installation date.
- Warranty depends on registration, ownership, installation and the applicable certificate.
PRIMARY-SOURCE BOUNDARY
What this tool can—and cannot—confirm.
Carrier officially directs owners to the equipment rating plate and warranty lookup. Lennox publishes supported serial formats and a warranty lookup. Recent Trane recall records provide bounded examples of a year/week serial pattern. CoolCompare uses those sources conservatively and does not claim universal decoding.
Sources reviewed August 13, 2026. Manufacturer databases remain authoritative for warranty and product identity.