I would how ever drop your temps to a max of 85. 90 is pushing it and can cause problems. Most keep colubrids at around 82-85 warm side and about 75 cool side. If you have a room in the 80s you can give them that with no warm side and let them have room temp.

I currently give my corns room temp and no heat as its 82 in here all year.

Humidity i try to keep around 40-50%