I can't imagine not having AC. All of the schools in the district in which I'm student teaching have AC. Staff can't control the temp because it's controlled by a center off site, and it shuts off at 4pm, so the teachers who stay late sweat in the humidity. I remember one day the AC broke and the school couldn't get it back on, so they sent an e-mail to all the parents to let them know. There were so many parents calling in to pull their kids out. My mentor's classroom had half the class gone by 11am!