I use the ZooMed Repti Fogger for my glass tank. I'll have it on until I start to see condensation on the walls of the tank and then I'll switch it off for a few hours. It has worked for me as far as keeping humidity up. You can change how much fog you want to be put out also. I usually keep mine on the lowest setting possible and it works just fine. My BP has had a perfect shed both times for me.

There are down sides though. One, you MUST use distilled water or the humidifier will clog. Also, the fan will most likely go out on you after about 2-3 months of use. Mine did, even with only ever using distilled water and not running it all day. You can call ZooMed though and they'll send you a new fan. It's easy to install too. I just got mine a couple days ago and it's working better than it was when I first bought it. The first fan was so loud. I couldn't keep it on at night, just because the bf would complain. Any who, I've seen some reviews from people who had it last for well over a year with no problems..and others that said it pooped out after just a week. It's pretty unreliable, but when it does work, it works wonderfully.