If the snakes arn't able to cool off they'll eventually die. What it seems like to me is that your temps stay around 96 degrees no matter what. I suggest moving the snakes to a location where you can better control the temperature for a while. At least until it cools down. Where My ball pythons are I have an ambient heat of 80 degrees and hot spot of 92-95. Do you have a digital thermometer so you know the exact temps in your enclosures?