The only time I every felt the need for a fan was on the Sun Princess. We will in a very small inside cabin. It was probably all in my head but a fan would have been nice in that room.
You could not get out of the bed on the side, had to craw out to the foot of the bed.
BTW this might be my last post. As soon as my wife finds out I posted an image of an unmade bed and room life as I know it will end.