Contents Voltage. fan coils Manufacturer model numbers Carrier enterprise proudly distributes General hvac equipment High-capacity hvac system Age: Through the 1960s Carrier used the first digit of the serial number to indicate the year of manufacture. Example: 3xxxxx = 1963, 4xxxxx = 1964, 5xxxxx = 1965, etc. The model and serial number can be found … Continue reading Carrier Hvac Serial Number Lookup