Another option rather than a window AC:

Rebuilding after a bad storm is a long, painful,and  aggravating process that I don’t wish on anyone, but I got lucky over this past summer. I only lost the shed that was in our backyard while the two of us were in the hurricane that swept through the area. To be tolerable though, that shed was almost thirty years old, and it was terribly built in the first instance! With the storm season being done and over with, I had an option to rebuild that shed into something worthy of use for storage, exercise, and anything else I’d like, but after I finished building the shed to our liking, I had to suppose about whether I wanted to install some means of keeping the shed moderate and cool while the two of us were in the Summer months of the year. There were plenty of options, even for a small shed such as mine, and the temptation was there to simply leave it be to save some money for another project… Ultimately, I decided to install a smaller version of a whole-home fan in the shed. Also known simply as an exhaust fan, and this wasn’t the kind of fan you see hanging from the ceiling of your bedroom! This was an in-line ventilation point in the roof, where the heat that builds up inside the shed all day long can be dispersed out into the open air. As long as the window or door to the shed was left open, the exhaust fan would literally pull the heat out of the shed, while the cooler air outside of the shed would be shoved in by the change in pressure. This was more economical than installing a window-mounted cooling system unit, that was for sure.

window ac