The wheezing could be a bit of skin in the nostril. I vet check is always a great idea when you are unsure and think there could be a problem. As for your humidity issues, I personally think the best quick fix is a damp towel over the screen, changed daily. I would also avoid that drop below 80 at night if there is anyway you can get the heat up, that will not help an RI if that is indeed whats causing the weeze.