You don't say what model RV you have. Behind our outside fridge, there are two round vents to the inside of the TT. They are covered inside by standard heat vent louvers. This allows for air flow, but on hot days the outside of the fridge still gets warm. If you have these vents, be aware that ( at least on ours) there are no screens and the heat attracts insects who then fly thru the holes if the outside kitchen door is open. I popped the louvers off the vents and hot glued a piece of window screed over the holes and no more bugs.
2015 Freedom Express 248RBS
TV 2015 Silverado HD2500 Duramax
TST Tire Monitors
Honda 2000I + Companion
2 65W solar panels