No problem, it is natural to be concerned. You should be, but they are very resilient. Smaller diameter bowls is likely more efficient but that may mean buying something else. A second thought is pull the bowls during the day say 8am-5pm during the hottest part of the day and replace them in the early evening and over night. Typically they are not likely to drink during the day and if they need they still have water over night. What is the room humidity and the enclosure? If they are about the same there is little to do. Again ventilation but if the room and enclosures equalize then it is fine. personally I humidify the room when needed (winter now it is 66%) I don't try to hold 'extra' in the enclosures.

I am sure they will be fine. If it gets too hot skip feeding the Barkers (VPI) say that they can handle for days 100ºF temps as long as they are not digesting. It isn't going to last so get through band aids will be fine.