new at owning a ball.. ur setup is like mine only lights are a must in my situation lol live in alaska with a room temp of 55 to 60 max i just recently covered the back of my glass cage with tinfoil shiny side pointing into the cage.. this keeps alot of heat in since my lights bounce off it and back into the cage. uth are not as horrible as ppl are saying on this forum though.. buy a zoo med uth for a 10 to 20 gallon cage.. on the glass right over the uth in my cage gets to 93.1 max with no light.. but like i said my room is 55 degrees if you have an 80 degree room then yes you would push alot more heat. substrate i use is dirt with coconut fibers.. zoo meds eco earth like 3 bucks for 30 gallons of it.. cheap and very effective at keeping humidity..
on this forum imo you have to do what works for you and your snake.. ppl in vegas arent going to have the same setup or needs as alaskans... so keep this in mind before you go making your cage like others my biggest issue is heat when my room gets colder so does my cage so i have to up the wattage of my lights..
digi probe thermometers are the best imo you can set the prob under the hides to check the temp the exact temp lol just let them sit there and see what ur over all temp is if its to hot move some stuff around to cold ... move some stuff around lol
oh and dont subject your snake to these changes test everything while your snake is out of the cage .. you might stress it out even more then it already is