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Inside the house with the AC on, the humidity is very low. Inside the cages. It's around 50%.Depends all on your humidity levels. This is where a hygrometer comes in handy to determine humidity levels. If your night time humidity levels are quite high just from misting and live plants trapping in that humidity, then there is no need for a humidifier. Nighttime humidity levels should be between 75-100% humidity.
Humidifiers help add humidity to your cage. If you already have the necessary humidity, then you don't need one. If you need additional humidity, then you need to get one. The only way to definitively know if you need one or not is if you measure humidity. If you have already measured the humidity at night and it falls between this 75%-100% humidity, then you do not need to use a humidifier.
You say you live in Florida which is pretty humid. What is your in-house humidity though?
These will only run at night for the night time bump in humidity.Is the cage humidity only 50% at night even with the mistking? Or is that the humidity before misting? If 50% is your daytime humidity then that should be fine. Just remember daytime humidity should be between 30%-50% and night time is 75%-100%. If your daytime is 50%, then that is fine. But if your nighttime humidity falls under 75%, even with the mistings, then you should hook up the humidifier to the fourth cage as well.
If you look at the care sheets from https://chameleonacademy.com/caresheets/, you can see that Veiled chameleons and Jackson's chameleons essentially have the same temp and humidity requirements (only that the ambient temp veileds can tolerate is higher). Make sure that you are hitting these temps and humidities for all your chams. Veiled's are more montane than once thought.
The lower you can get your temps at night, and the higher you can get your humidity at night, the better off your chameleons are.
A good point to mention @CasqueAbove, as said above, Jackson's chameleons are more sensitive to supplementation than veileds due to different metabolic rates. I use arcadia earth pro A every feeding and Repashy Calcium Plus LoD twice a month--even though I have a solar meter to ensure proper exposure.