Generac 10 Year Air Cooled Extended Limited Warranty Extension10 Year Extended Limited Warranty for Air Cooled Product Evolution Controller Models. Warranty 10 Year Extended Limited Warranty for Air Cooled Product Evolution Controller Models. Warranty Covers 10 Years Parts & Labor*. Can Be Purchased Post 12 Months of End User Registration Activation Date, Which Will Remain As The Start Date. Unit Must Be Registered & End User Proof of Purchase Must Be Available Upon Request. Available on Generac, Honeywell, and