Help with Airflow into bedroom.

Thanks for all the ideas. I was trying to think of a way to put a fan into the wall to move air into the room. Thought of the computer fans that run off dc but couldn't find a way to mount them in a vent. Didn't think about the window fan. Might be the way I go. I looked at the corner fans from amazon couldn't find a way that I liked to run power to them. Or think they would put out enough air. I'm very hot natured and that is the reason I'm looking to do this. I was wondering if there might be some duct work in the celling that could be used. But not brave enough to cut into a new camper like that yet. Not the celling anyways.