I would agree with checking, or adjusting temps and humidity more carefully. If there's not a significant amount of 'spit' or bubbles (or frequent mouth opening) then it should be fine to do some preventative steps to prevent serious RI. If it's come close to this...prepare for ritual shots, or oral meds from the vet. (GO with the shots) I unfortunately had to deal with this last winter and it wasn't fun at all

Good Luck!!