Exhaust Fans up stairs are super important. I was working up stairs in my hauler this winter when it was like 40 degrees outside sweating my ass off. Roof vents with fans is plenty the AC is kinda over kill for the once a year you will use it. If it's hot go in the Toter. 110 plugs in the wall everywhere is the most important. We plug fans in upstairs at the shows before start to tear down. Air flow up stairs in super important.