Lysa,
I had (have) almost the same exact problem - one ball python in my first new Boaphile 36x24x18 cage (with the installed heating)in a sometimes cool room. My room temps are a little better than yours, but not much. Here are a few things to try if you haven't already. They've helped me somewhat.
1. Insulate the bottom of the cage with something - I covered the table in Al foil and then put a piece of plate glass on top of it and the cage on top of that. It helps to keep you from losing heat out the bottom, which is where it's being generated in the first place. Before I did this, I used my temp gun to measure the underside of the table, and it was about 85 degrees, meaning the flexwatt in the cage was actually heating through a 1" wood table instead of heating the cage. The insulation helps to direct some of the heat back where it should be.
2. Manipulate the hidespots - the temperature gradient may be 92-69 across the whole cage, but it's probably more like 92-80 across the warm half of the cage. Move the "cool side" hidebox to a spot that will not be unacceptably cold for the snake during the day. At night, when he's out crawling around from warm side to cool side, it's probably less of an issue than being in his hidebox for 12 hours at 72 degrees. Just make sure to check temps with a probe in the actual hide box to make sure you're not forcing an overly warm situation.
Let me know if you come up with other ideas, because I don't think we're the only ones to have this problem. I think Boaphiles are excellent cages, just not equipped with enough heating for a cool room. Good luck.
Jay
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1.0 Ball Python
0.0.1 Corn Snake
1.0 Leopard Gecko
1.1 Crested Geckos
1.0 Red Eyed Tree Frog
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"The more people I meet, the more I like animals."