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Hi Josie,
It is challenging to prevent all possible condensation in a roof to mounted a/c unit. This main cause for this is due to the drastic difference in temperature from the inside and outside. This difference in temperature and presence of humidity of where your are located (i.e. Florida vs. Arizona) will ultimately affect this. Properly insulating you van (Walls, Ceiling & Floor) and sealing off the air space around the roof top a/c unit's duct area is the first step.
The second step would be to coat the exposed circuit board with a conformal coating to protect form moisture shorting the circuit board prematurely. I describe how to do this below, hope that helps!
To protect your RV air conditioner’s circuit board from condensation, use a conformal coating spray. A conformal coating spray is a chemical layer that forms a thin, non-conductive film on the circuit board, shielding it from moisture, dust, and corrosion. Start by cleaning the board, masking sensitive areas, and spraying the coating evenly. Once it cures, the board will be better protected against moisture (but not waterproof).
Original question by @josie5054 from https://www.youtube.com/live/Fc3f-_KJ4eY?si=P0cahS47-8U6-IxY
