How to determine the date of production/manufacture or age of Semco® HVAC Systems.

The date of production/manufacture or age of Semco® HVAC equipment can be determined from the serial number located on the data plate.

Parent Company:  Semco, Inc.

Example serial number styles/formats found:

  • Style 1:     35958M02203301

Style 1:   35958M02203301

Description: Unknown, however it is believed (but not confirmed) that the two digits following the letter “M” in the middle of the serial number represents the year of manufacture, and the next two digits represent the week of manufacture.

Unfortunately we are unable to determine the date of manufacture or age of these units. Perhaps you can assist us in our research with additional information.
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Using the ANSI or CSA standards to determine approximate Date of Manufacture.

Most manufacturers today are required to include the manufacture compliance standard on the data tag. For the U.S. the compliance standard is typically from the American National Standards Institute (ANSI). For Canada, a common standard compliance is through the Canada Standards Association Group (CSA). Many times both standards are listed. Regardless, the specific standard will normally be listed on the data tag/plate and followed by the YEAR of the last revision (often the year is placed in parenthesis or follows the hyphen after the specific standard number). As these standards are revised or renewed approximately every 4 to 6 years, one can reasonably estimate the year of manufacture within 4-6 years from (after) the standards date.

Page last updated: 2 April 2016

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