Wait for the vet. Anything I or anyone else says is just guessing your vet will have better judgement as they are there with your snake.

If you are sure of the temps how is the ventilation? Guessing again, there is a documented relationship between poor ventilation and high humidity with respiratory issues.

The only reason for looking at environmental issues is so often reptiles get sick due to a lowered immune system (tied to temps) or a over abundance of harmful bacteria or fungi (poor air flow and high humidity = petri dish) It is not always the case but often sickness is tied to husbandry conditions.

I wish there were real help to offer but the best I can do is guess and look to the obvious.