AC is expensive in general and yes he does use it or did rather. He hasn't grown in a while but I don't doubt him. Besides that is not the first time that I have heard of using a humidifier in a grow room set-up.
I like to do a little research before making any arguments so that I do not come across as a complete idiot and this is a pretty good read as far as humidity regulation goes
http://www.growweedeasy.com/humidity. It states that plants in vegetative state like more humidity(around 40-70% RH). Right now my room has been sitting at 10% for a while now and that may explain why my plants seem to be dying a bit. I will try a humidifier and see how it works. I will likely pick it up on Wednesday and I will post back when I get the results.