I have not seen that before in my ball pythons--even ones with a respiratory infection. It does sound a lot like something I would expect from an RI.
If you think that the snake may be fine: you can examine the sides of the cage and if there are semi-translucent streaks on the walls this would indicate an excess of mucus being wiped off and a RI.
I don't let any of my ball pythons fall below 80F ambient after my first RI run-in due to a 'reputable' breeder telling me to lower the temps of my collection to 75F in the winter to facilitate breeding in the Spring...