You don't say what year rig or what type of AC unit you have. All the AC units have filters the furnace usually doesn't. AC's that have a dump in the room have a filter built in where the return air is. AC's that are fully ducted have air intakes, usually behind grills on both sides of the room even with the AC unit. In either case you need to remove the grill and clean the filter regularly. In our case we clean them every other week.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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