I've used some ultrasonic foggers in the past, used to use humidifiers and pipe them
into cages too. Weren't the most effective means of keeping humidity up in Arizona but they did help. The look of the fog slowly rolling through a naturalistic setup looked so cool I couldn't care less if it helped or not haha. I've still got a big apple herp high pressure misting system that hasn't been used since 2006 sitting in my garage I keep thinking about setting up on the retic cages.