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    Armstrong Air® HVAC Age Checker

    Enter your Armstrong Air serial number below to determine the manufacturing year of your HVAC system

    The serial number is usually found on a label on your HVAC unit

    Add model number for AI-powered specs including tonnage, SEER rating, and features

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    How to Find Your Serial Number

    Your Armstrong Air serial number can typically be found on:

    • A metal nameplate on the outdoor unit
    • Inside the blower compartment door of the furnace
    • On your original installation paperwork

    Note: Armstrong Air is part of the Allied Air Enterprises family of brands.

    Armstrong Air Serial Number Formats

    Style 1: 4607B20058

    Ten character format used since 1993. Year is 3rd-4th digits (07 = 2007). Month is 5th character (A=Jan, B=Feb, C=Mar, D=Apr, E=May, F=Jun, G=Jul, H=Aug, J=Sep, K=Oct, L=Nov, M=Dec). Note: Letter "I" is skipped.

    Style 2: A14019ELA (1978-1992)

    Nine character format used 1978-1992. Month is 7th character (A=Jan, B=Feb, C=Mar, D=Apr, E=May, F=Jun, G=Jul, H=Aug, J=Sep, K=Oct, L=Nov, M=Dec). Year is 8th character (8=1978, 9=1979, A=1980, B=1981, C=1982, D=1983, E=1984, F=1985, G=1986, H=1987, J=1988, K=1989, L=1990, M=1991, N=1992).