York · Luxaire · Coleman · Johnson Controls 4-Digit WWYY Format
York Serial Number Age Lookup
Find your York furnace or AC manufacture date.
York and Johnson Controls encode the production week and year into the 4-digit date block of modern residential HVAC serial numbers. Enter your serial number below for instant informational decoding.
York Date Code Decoder
Enter your York serial number.
Locate the rating plate on your York, Luxaire, or Coleman residential gas furnace, heat pump, or AC condenser to decode its production date.
Enter your York serial number above
Type the serial number from your equipment rating plate to decode the production week, manufacture year, and estimated age.
How York Encodes Age in Serial Numbers
Modern York residential HVAC serial numbers typically feature a 4-digit date block (WWYY) indicating the production calendar week and year:
Example: Serial Number 1218A12345
- Digits 1 & 2 (
12): Calendar week of production = Week 12 (late March). - Digits 3 & 4 (
18): Manufacture year = 2018. - Letter (
A): Manufacturing plant identifier code. - Remaining Characters (
12345): Sequential unit production number.
Where to Find the Serial Tag on York HVAC Units
York Gas Furnaces
Turn off power, remove the upper burner access door, and locate the rating sticker on the inner cabinet sidewall near the burner assembly.
York AC Condensers & Heat Pumps
Affixed on the exterior metallic cabinet near the service panel, electrical line entry, or refrigerant valve access ports.
York Air Handlers
Printed on the front service panel or inside the blower compartment door.
York Packaged Units
Located on the outer service access panel near the electrical line entry.
Frequently Asked Questions
How do I decode a York furnace or AC serial number?
In standard modern York (Johnson Controls) serial numbers, the first two digits represent the manufacturing calendar week (01 to 52), and the subsequent two digits represent the manufacturing year. For example, in serial 1218A12345, '12' represents week 12 (late March), and '18' represents the year 2018.
Does this serial decoder work for Luxaire and Coleman HVAC?
Yes. York, Luxaire, and Coleman are sister brands manufactured under Johnson Controls Unitary Products Group, sharing identical serial numbering and date-code formulas.
Where is the serial number located on a York furnace?
On York gas furnaces, disconnect power and remove the upper burner access door. The data plate sticker is located on the interior metal sidewall near the burner assembly or electrical junction box.
Disclaimer: This HVAC serial lookup tool provides an informational estimate based on York and Johnson Controls date-coding documentation and third-party industry records compiled by the Building Intelligence Center. Always verify the serial number directly from the unit rating plate. Never attempt gas valve, heat exchanger, or high-voltage electrical repairs yourself; always consult a licensed HVAC contractor.