Got a small trailer with no cooler that is well insulated. Window fan brought in cool night air, but by 3 in the afternoon cool ran out, and none to be had. Checked internet for comments, and called Pro-tech. They fit me in, and in one days work a A/C unit was installed. Now am cool again, and don't have to worry about unhappy skunks in the night. Most A/C units are similar, so look for good service to be comfortable.
From my experience, I recommend Pro- Tech.