Reddit reviews Holmes Dual Blade Twin Window Fan, White

Just one window definitely makes it harder, but you can still get some circulation going if you put a box fan in the window.

I suggest turning the fan to blow out during the day, with the bedroom door open to allow air flow.
Then turn the fan to pull air in during the cooler evening/night.

you're better off not bothering with those little window fans like this , because they are pretty much always too weak to do any good.
Get a basic box fan like this , and just cover the window space next to the fan with a board or curtain or something.