Armstrong Air HVAC Age Lookup by Serial Number
Decode your Armstrong Air serial number to find the manufacturing date, system age, and maintenance recommendations. Free and instant. No account needed.
Finding Your Armstrong Air Serial Number
Check these four spots on your HVAC system
Common Locations
What to Look For
- White or metallic manufacturer sticker
- Labeled "Serial No." or "S/N"
- Typically 8–12 characters long
- Usually near the model number
Can't find it? Try the electrical access panel on the front of the outdoor unit or inside the air handler cabinet.
Serial Number Examples
Don't worry if yours looks different — each brand has multiple formats and our system can decode most variations.
About Armstrong Air HVAC Systems
Armstrong Air is part of Allied Air Enterprises, which Lennox International owns alongside AirEase and Aire-Flo. Manufacturing happens at the Allied facility in Iowa, built to Lennox engineering standards. Armstrong Air sits in the mid-range residential market, with more features than the bare-bones brands and a lower price than Lennox's own premium line. Serial numbers use the same format as all Allied/Lennox brands: four digits at the start, with the week number in the first two positions and the two-digit year in the next two.
Supported Brands
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