I use a Zoo Med Hygrotherm controller for ambient temp(with CHE) and humidity (repti-fogger), set at 52% most of the time, then raise it to 62% when she is in Blue. Had humidity issues before this setup, rough sheds when too low, belly irritation when too high, especially if any substrate was damp, using an Exo terra glass vivarium with top mostly enclosed with plastic pannels. The controller works beautifully, coupled with the UTH and thermostat controlling it, ambient temps, UTH temp and humidity are always perfect, sheds are always quick, in 1 piece, and no issues with mold or belly irritation being the aspen substrate stays dry. Buddy with a couple Boas uses the same setup for a BCI and BRB, it makes it easy to set an ideal environment with little work to control it, other than filling the humidifier bottle, weekly in the winter, lasts a month or more in the summer.