How to Tell the Age of some Common Furnaces

How to tell the age of some common furnaces is by the serial number
The 3rd and 4th numerical digit is most often the year it was built:

4006A17330 so the age would be 2006

Carrier
Comfort-Aire
Lennox
Trane
Payne
Keeprite
Heil
Bryant
Armstrong


YORK
Luxaire
W0K5896070 2nd and 4th digit are year built

Rheem/Ruud
Style 1:     7351 M2806  16735
Style 2:     OR177 M2807  00097
Style 3:      0804B10488Red is year built

Goodman
150945784520 1st and second digit are year built
Serial number is typically inside the front cover.
How to tell the age of some Air Conditioners
Refer to notes above.

The manufactures use the same serial numbers to identify went the unit was built.

If you want a full list go to:
Building Intelligence Center
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