I wouldn't worry about a humidifier. Yes plants do grow a little faster with higher humidity. But then comes the worry of mold. I am all about maxing out yield and do pretty well but I try to stay under 60 percent humidty. I've recently had to burn my wooden tables I built, and buy metal frames, spray down my whole veg room with h202 multiple times. Then keep spraying plants for mold. Lost a tray of clones that was suppose to be my next run to mold. Got back on track and it happened again, cleaned veg room added a dehumidifier, and so far so good. Anyways what I'm saying is humidity above 60% is not needed, I had read an article months ago from either quest or anden that had said while plants might like the higher humidity that rooms and equipment don't handle it as well. I wish I had listened it would have saved me some time, money and stress.