After reading the other forum, it sounds like people are a little worried about you stirring things up because the old quarantine rules were even worse (someone said something about lifetime quarantine for imports).
Can you "cheat" the system by keeping the room 28 but use misters to provide cool spots, explaining them away by saying the chams need constant access to water?
For that matter- can you cheat by measuring temp in one part of the room but provide cool areas in cages (say along a north facing concrete wall) where nobody measures temp?
edit- the panther chameleon attrition rate experienced by the other guy could be the result of where his panthers came from and time of year, not just the temp. I remember 15 years ago there were certain times of the year when it was a bad idea to buy imported panthers because they would be extremely weak and heavily parasitized. It may still be that way, or may still be that way with some exporters.