Well the room that I'm in stays below 80 I'm guessing. I'm not entierly sure, but I'm usually kinda chilly (I don't have any control over the temps in there). I'm not using a tub yet, but when I get more snakes I'm going to get a rack instead of the tank that I have my girl in now. There isn't too much airflow as long as your not right in the path of the vent, which a rack wouldn't be, so that should be pretty stable. I don't have any control over the room temps at all, so they will change some.