You can post a million times or pickup the phone and call Tiffin Service. They can tell you where the fuse panels are located.
While things move based on model year or model, the main A/C panel could be in the bedroom closet with the house 12V panel below it. Tiffin stopped using fuses a while back and everything is circuit breakers where possible. The chassis related fuses are generally below the driver in the first compartment and in the compartment on the passenger side that houses the chassis start batteries.
Roger & Mary
2017 Winnebago Navion 24V (Sold)
2014 Tiffin Phaeton 36GH (Sold)