How to determine the date of production/manufacture or age of Wesper® HVAC Systems.
The date of production/manufacture or age of a Wesper® HVAC unit can be determined from the serial number.
Serial number styles found: (NOTE: Serial Number styles found for Fedders-Airwell are being used here. Although unconfirmed it is believed that all Fedders-Airwell units use these styles.
Style 1: EW020144126H
Style 2: 02J-60002
Style 3: AS298488006X
Style 4: ARM75812
Style 5: 12345AN