The 1st and 2nd digits of the serial number are the year.
The 3rd and 4th digits of the serial number are the month.
International Comfort Products is headquartered in Lewisburg, TN. They are part of Carrier Corporation, which is a unit of United Technologies Corp. In the serial number, the first letter is the place of manufacturer. The first pair of numbers is the year, and the second pair of numbers is the week.
Since 1974, the first and second digits are the manufacturing plant; the 3rd and 4th are the decade and year, and the 5th digit is the month (skipping 'i'- see table below).
The 1st and 2nd digits of the serial number are the week
The 3rd and 4th digits of the serial number are the year.
Since at least 2000, Trane has been putting the manufactured date in English on the Tag.
Since 2002, the first two numbers of the serial number are the decade and the year it was manufactured.
Before 2002, the first letter of the serial number indicated the year it was manufactured as given by the table:
The next two numbers are the week, it was manufactured.
|Trane Date Codes|
The second alpha character (not necessarily the second digit) in the model number will either be a T or a W: T = cooling, W = heat pump.