I use one in every enclosure I have . Just put it on a cycle timer . They sell a timer at Home Depot that plugs in the wall then you plug your humidifier into it . You can set it to come on fifteen minutes every hour . If that's what it takes to keep humidity up .
We seem to be mixed on this question. some of us use them and some of us don't.
In my climate and in my closed chamber, I do not.
We all seem to have good results for the most part.
start with a nice digital temp and humidity gauge. With the cheesy dial types, you'll be fighting with the thing.