I'm very new to owning snakes, my son has a ball in a glass enclosure it's not as big probably a 30 gallon tank but we use a Uth on a hydro farm thermostat and a che on a dimmer above. We have two digital thermometers with probes. One probe is under substrate above the uth. It reads between 94-95 degrees. That creates around 88-90 on the surface for the hotspot. The other thermometers probe is about 4 inches above the bottom of the tank on a wall measuring ambient temps. It reads around 80-82. Humidity is difficult to keep up. In the winter our house averages 25% humidity. I mist often and have a humidifier in my sons rooms. He is in shed so we have to mist alot to achieve a 60-70% level right now. It can be done. We look forward to a animal plastics cage in the near future.
good luck