My jungle carpet python has been battling a respiratory infection for the better part of the past year. She had one, and I raised the temps & lowered humidity, and it went away. As soon as I raised humidity again, the infection came back. We made a trip to the vet, and came back with $75 less in my pocket, a bottle of Baytril and a couple syringes. The infection went away, and she was fine for about a month. I changed her cage again, adding in moist Bed-A-Beast, and BOOM, the infection is back. This has been on and off now for around 10 months. She'll go a month without any wheezing, and then as soon as the temps drop at all, or the humidity raises at all, she begins wheezing again. Now, she's gone almost two months perfectly fine, until we hit a cold night. One night at temps below 80(surprised me, and got down to the low 70s), and she's wheezing so loud you can now hear her all the way across the room. With every breath, she's wheezing like this.
The odd thing is.. the whole way through, there's been no discharge, or visible sign of an infection. She's continued eating (she's like a bottomless pit!), continued moving around.. No real loss of activity or anything. When I took her to the vet, he told me that he didn't see any sign of an infection, and that if it wasn't for me hearing her wheeze, he wouldn't believe she had one.
What else can I do? Asides from baking her, and not letting her have water more than once every couple days, for an hour at a time, I can't come up with anything.
I lowered humidity by removing the dish & only putting it in at certain times, to let her drink, and I increased ventilation.. But that in turn lowered temperatures! I already have a heat pad under her, and a 75 watt light bulb over her..
Does anyone have any suggestions? I'm really at a loss; I've tried everything I can think of, and she's driving me crazy. I can't stomach sitting here listening to here wheeze any longer, I feel so bad for her.

