Cars & Other Vehicles How long is the warranty on a Carrier AC unit? How do I know if my AC is still under warranty? Most manufacturers allow owners to look up existing air conditioner warranty information on their websites. This is usually done by entering the unit's serial number, which will recall all warranty coverage associated with the system.Mar 13, 2018 How long does Carrier warranty last? 10-year Related Posts:Carrier AC Error Codes, Carrier Dc Inverter Air Conditioner EC Error Code, and Carrier Jasa service ac error codes are listed.9 Smallest Window Air Conditioners are on the market, and they are the best.PDF GE Zoneline: The Quietest Air Conditioners in the Industry.Can I add extended warranty after purchase?