Also spraying every 30 min is not necessary. Just maintain the humidity in the cage. Once you back down the temp the frequency that you spray should decrease as well. 2-4 times a day for a few min or more at a time
I have heard similar and I switched over to the tube style and bruce seems to like it better. Could also try hanging it up off the top of the cage a small distance.
In front of a window is the best idea, gives your cham fresh air and sunshine. Just make sure there's a shaded spot in the cage for the little one to hide out of the heat if necessary and make sure the humidity stays up. Bruce loves his window and goes right to the others when he goes free...