I had the same problem in my last apartment, their spare room would just get way too hot. So I did two/three things, I installed curtains that would cut out the hear coming in through the window during the hottest part of the day and then just switch off the basking spots completely for a couple hours between 12-2. At the same time, I had a long misting session that went off at that time too, for 10 minutes or so. That helped significantly, because with the heat from the window and the basking spots on, their basking areas would easily read over 115F (WITH the AC on!).
So by doing these things it helped quite a bit. The room wouldn't get warm and I wasn't worried about them baking in their cages. And besides the peak hours of the day I didn't have to change the wattage of their cage lights, because they did fine, but on those blistering Florida summer days I definitely had to tweak things a little to keep it livable.