I've been reading up on the closing the valve thing. Most places are saying it should be either all open or all closed, not in between. All open is preferred to prevent air in the vents. A few places I read said to leave the valve open always, but to turn the air valve upside down to prevent heat coming up. I can't get that thing to budge and don't want to force it, so I'm not sure it that'll work. They all say open windows is the way to deal with too much heat when valves are open...however plenty of times I have had to open the window with the valve closed! I'm not a fan of too much heat, I need air. Of course this weekend was karma kicking me a good one I guess. In any case, I will probably still have to turn the valve off, but I'll be sure to keep it on for these super cold days. As to the humidifier, I actually bought one of those today too. But I got then warm misting kind. Is gone up slightly in the room from 29% to 31%. I'm going to move it to my bedroom to sleep with because I have been getting crazy dry throat issues, obviously.