This could be interesting to try on a tiny trailer. I have no idea if small spaces would be a better use of this method than large spaces but it seems like as long as you have an inlet and outlet to create a draft it could keep temps a bit more comfortable in hot weather. The article says it lowers the room temperature by 10º.
Here's the full article I stumbled upon: http://www.cleverly.me/diy-ac/?ref=fb
Or just watch the video: