So, here's this: Our temps soared to the low 90's for the past 3 days and the ambient temps in tubs and cages only went to 86F. I have them surrounded by rigid insulation which is, I still think, a good thing to do. (We don't have air conditioning and won't get air conditioning.) I wonder if it was the insulation that moderated my temps?
In the winter (isn't it going into the winter now?) you might want to look into a radiant heat panel since that will warm the tank bottom as well as keep the ambient temps up. RHP's are just as good for ball pythons as belly heat.