Like Euphoria, I live in The Car Wash State (WA) where it rains. A LOT. In the winter, it rains virtually every day. My camper is under a cover and protected from the wind, but it's still exposed to outside temperatures.
In the winter, in 'dry dock', I run an 'oil heater' in the camper. It's an enclosed heater, no exposed flames, no fumes, and it's silent. I do this primarily to ward off and prevent mildew (the state flower).
When we camp, it's usually in cold areas and if we don't open a window or a vent as we go to bed, there will be condensation on the windows in the morning, just from our respiration. . I wipe it off as part of morning maintenance. Same goes with the bathroom/shower. After a shower/bath, we squeegee the walls down and make sure everything is nice and dry. This, again, is to prevent mildew and mold.
If you cook inside the camper, open the range vent. That dispels most if not all moisture laden air from things like coffee pots, etc.
But for run of the mill condensation, no. I've never had any issues with condensation in the Casita.