Decode your Goodman HVAC serial number instantly. Find manufacture year and week from the first 4 digits. Works for all Goodman AC units, heat pumps, and furnaces.. Wondering how old your Goodman air conditioner is? You can find the Goodman AC age by looking at the unit's serial number, which contains a hidden date code.
Enter your Goodman serial number to find the manufacturing date and age. Goodman is owned by Daikin and carries a 10-year parts warranty when registered.. Learn how to determine your Goodman AC age using serial numbers with our step-by-step guide. Decode year/month of manufacture, locate rating plates, and understand warranty implications. Updated for 2026.