Currently have a wooden terrarium with a glass front with a single male shingleback as it's occupant. Using a ceramic heat emitter on one end and a uvb light across the terrarium. Days with normal room temp (25 degrees centigrade and under) I have a nice 5 degree difference in temp. Anything above 25 degrees however and the temp pretty much just equalises. Concerned because obviously he won't be able to move to a non-existent cool end. I've tried leaving the fan on in the room and even pointing the fan into the vent, to little effect. Any suggestions on how to keep the cool end cool on hot days?