What TM model are you looking at? Our T2005 TM 2720 has three windows in the rear queen bed area, left, right and rear.
My wife has the same problem as you, so I understand the issue.
We rarely have hookups, so we never use the a/c.
If it is too hot to sleep and no power for a/c then I clip a small 12 volt fan to the top of the bathroom wall and plug it into the cigarette lighter at the bottom of the wall. It is pretty quiet and moves enough air to solve the problem. But, we live in a low humidity environment. I have no experience with high humidity areas.
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