Unplug the uth no need for it if your ambient are in the mid 80's low 90's
If possible put the tank on the floor, place a big ceramic bowl in the enclosure filled up with cold water (snakes will cool themselves wrapping themselves around them)
Check the body core temp of your snake using a temp gun rather than going by the room temp there will usually be a difference of 2 to 3 degrees between both.
My snake room is kept at 86/88 in the summer with no issue