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How do I tell the age of an Armstrong Air furnace or air conditioner from the serial number? Wednesday, June 13, 2018. The 8th digit of the serial number, which NAHA00601WK 80% Gas Furnace Twinning Kit, Accessory; 6/12/2018, Current. NAHA00801LP 80% Gas Furnaces Natural to Propane Gas Conversion Kit08-22-2018 .. FURNACE CLEAN AND CHECK MODEL# GCK075D14-3A FURNACE INSPECTION AND CLEANING MODEL# GUJ075D10-1 18 Jan 2018 ENERGY STAR guidelines for energy efficiency. Visit www.energystar.gov. Certifications. Wi-Fi® is a trademark of Wi-Fi Alliance Corporation. 3 Sep 2017 Armstrong Air® HVAC Age. How to determine the date of production/manufacture or age of Armstrong Air® HVAC Systems. The date of