How old is my GE Zoneline unit?

GE Zoneline is part of GE Appliances. 1 serial format sourced across ptac.

• GE Zoneline PTAC serial numbers in the 1944 to present format encode the year as letter 2, 12-year cycle (table below) and the month as letter 1 (table below) (source: building-center.org).
• Example: serial ZTN730A100AC decodes to 2010 or 1998 or 1986 or 1974 or 1960 (December).
• The 1944 to present format is ambiguous: Year letter repeats every 12 years - narrow with ANSI date, condition, model era. Post-2013 assignments are extrapolated, not sourced. Same system as GE/Hotpoint/Cafe/Monogram appliances (batch 12).
• GE Zoneline's official lookup at geappliances.com returns warranty / registration lookup.

Decoder pages by product

Format eras

• 1944 to present VERIFIED
  AAA###A###AAPTAC, Refrigerator, Range, Dishwasher, Microwave, Washer, Dryer

What we could not confirm

• GE Zoneline is treated as sharing GE Zoneline (PTAC)'s format because the source lists it in that family; the corporate relationship itself is an estimate.
• Serial = month letter + year letter + factory codes (ZTN730A100AC = Dec, T = 2010/1998/1986/1974/1960). building-center credits the chart to geappliances.com/search/fast/infopast/10000722.htm. The 12-letter year cycle (A D F G H L M R S T V Z) repeats every 12 years; chart ends 2013, so 2014-2025 = D F G H L M R S T V Z A by extrapolation (flagged). zoneline warranty.htm = 200 (warranty text, no lookup); geappliances.com age-of-appliance page 404.

Sources

• https://www.building-center.org/zoneline-hvac-age/
• img: GENERAL-ELECTRIC-...-Style-1_-Date-Chart-1.jpg (transcribed; credited to geappliances.com infopast/10000722.htm)
• https://www.geappliances.com/ge/zoneline/warranty.htmofficial

GE Zoneline ptac GE Appliances and Haier family Guides