sick snake?

I have 4 ball pythons in 4 different tanks.My problem is I swear it sounds like one sneezes every so often while I am on computer. I have looked in all mouths all look fine. Not leaking fluid from mouth. Shoot OI am not even sure which one is doing it.
Heat is under tank 76-78 cool side
89-92 warm side any help

bump the cool side up to 80-82 and just keep an eye on them. Check their heads and see if they are tilting them at all.

It could be nothing at all...sometimes when they drink water they will get a bit in their nose and sneeze it out. But again....just bump the cool temp up and keep an eye on them.

Sneezing for my ball python was a early sign of RI I wouldnt get to worried, like the guy above me said, bump the heat up, but both sides and lower the humidity, My snake was literally flowing mucous out of his moutha nd thats what I did to my cage and he got right back into health with a couple weeks og antibiotics and changing his temps and humidity hope yours gets well :D