I have a baby Jackson I run my humidifier 24/7 - it's a cheap one I got at Target -I put a tube out the top it has a tube that directs it over one corner of the cage but the humidifier sits outside and is aimed at the area i am trying to keep cool and more humid the corner of the cage away from the basking light.
I do the top part when I add water - every day or twice a day . The bottom about every 3 or 4 days with the tubes. I'm a newbie - so if someone who knows better tells you something different I would go with that- but in general I would say the more you disinfect the better- I just use a antibacterial dish soap and rinse real well- when I do the tubes i soak them.