Well, most of it is about 5 feet, in the center it is at least 6 feet. I'm going to keep my eyes open for an AC unit. I have a temp sensor up there right now, its only 68, it about 65 outside. I'm sure that will change when we get a few days of sun. The shower board sounds like a better idea, I do construction so I have tons of scrap drywall, thats why I was thinking of going that way. Would there be any advantage to putting in a couple skylights?? Or would the moonlight hurt the flowering stage? Once again, thanks for all your input.