I bought one of these a couple of years ago when I had a pop-up.....mostly to keep the dog cool either in the trailer or the truck. They're quite handy, and can serve double-duty with drinks. I put an elbow connector over the output vent and attached a hose to provide directional cool air
As a boy we would get a wet towel and hang it behind a fan,
or place a fan in front of a pile of ice. And at the least place
a box fan in the window and spend the day sitting in front of it.
A/C? Refrigerators? Color TV? what were those things?