I have an outdoor building (327 sqft with tall ceilings) that I am using as a gym. It is basically 2x4s and plywood with a concrete floor. I want to put in an air conditioner for the summer months and I need some help/advice/opinions.
I was considering an in wall air conditioner, but they're expensive! So, I started looking into window air conditioners. I know they have the vents on the side, but seeing as the walls are just plywood, I thought it would be fine. I was going to install a platform for it to sit on.
There is a window in the wall between the gym and the garage. I don't know if I would be able to put it there instead of an external wall?
Is the external wall or the internal window a better choice? Will the window a/c work with a simple plywood wall? Is there a better way to do this? I've included a picture (pre-gym stuff moved in) to give a better picture of the room.
Editing to add some more info: I know that insulation would be ideal, but since I'm going to redo it, I'm not going to be spending the time/money doing that. I'm only going to be using the AC while I'm working out. It's more for humidity than for cooling. I know it's not the best situation, but I just need it to work for now