You can determine the date of manufacture based off of the 4 digits after the first letter in the serial number. The 2nd and 3rd digit indicate the year of manufacture, and the 4th and 5th digit indicate the week of that year the unit was manufactured. The following digits are the sequence number
Photo Examples of ICP Serial Numbers with Dates
Comfrotmaker A/C – 48th Week of 1992 Comfortmaker Furnace – 5th Week of 1992 ICP Commerical Rooftop Unit – 35th Week of 2005 ICP A/C – 48th Week of 2003 ICP A/C – 17th Week of 2005 ICP A/C – 41st Week of 2008
