Seems to me like the F53 chassis is Ford's issue and that they would have the same issue with every gas class A on the market today practically. So assuming that you are not getting the same substandard cooling that everyone seems to get from their dash...and indeed do have a defective AC...then Ford should fix it at no charge since you have a 3 year warranty.
No lemon laws vary from state to state and may NOT cover RV's...so you might want to check out the legal issue in terms of your rights in Florida and the requirements on you that the local lemon law imposes. Document everything!
EDIT: Here's the lemon law for FL... Florida Attorney General - Recreation Vehicles
It appears you're covered but would have some work to do to exercise that option. Snippet:
"If the recreation vehicle has been subjected to at least three repair attempts for the same defect that is not a defective living facility component, or has been out of service for repair of one or more defects that are not defective living facility components for 15 or more days, then, written notification must be sent to each
manufacturer (not the dealer)
which may provide warranty coverage of the defects. If the consumer is not certain which manufacturer’s warranty covers the complaint, it is better to send the notification to all potentially responsible manufacturers. The Motor Vehicle Defect Notification form may be used for this purpose or you may send a letter. The notification must be sent by registered or express mail. Click here for the Instructions and Motor Vehicle Defect Notification form
. Please refer to the section about Recreation Vehicles in the "Consumer Guide to the Florida Lemon Law" for further information about notification, manufacturer response and time requirements, as these provisions are different for recreation vehicles. Recreation vehicle consumers who wish to pursue the remedies available under Florida’s Lemon Law, are required to submit their disputes to an industry-sponsored mediation/arbitration program that has been qualified by the Department of Legal Affairs. If there is not a qualified program, or if a program’s qualification has been revoked, then, recreation vehicle consumers who wish to pursue the remedies available under Florida’s Lemon Law must submit their disputes to the Department of Legal Affairs for arbitration by the Florida New Motor Vehicle Arbitration Board.
The claim must be filed with the Department of Legal Affairs within 60 days
after the expiration of the Lemon Law rights period, which is 24 months from the date of delivery of the vehicle to the consumer. DO NOT DELAY!
RV consumers are NOT required to submit to any other manufacturer-sponsored program.
Recreation vehicle consumers wishing to pursue the remedies available under Florida’s Lemon Law should call the Department of Legal Affairs, Lemon Law Arbitration Division at 850-414-3500 for information regarding how to file a claim and to obtain a claim form."