Yep you right bro, need to rearrange later but i leave my rig in server room, 24x7 AC, no heating problem right now.
Oh yeah, since you are using full-time AC, it's no big deal. About a profitability, you need to know the best Algo for your Cards, sometimes you need to speculate on new coins. Keep open your eyes and keep watching any newest info.
any recommended website to watch.