In the desert when humidity is below 40% a "swamp" cooler provides a lot of cooling. Down side is the units are big and use water. If you don't move the rig a roof mount will work the best.
If the humidity is up consider replacing a window with a window mount ac designed for homes. You will likely have to fabricate a stand for the outside support, and do some fab for the window it runs through.
there are also both ac and swamp coolers that are portable and use large flex tubes to move the hot air out, walmart has both
jw