We were thinking about purchasing a humidifier soon (MH has issues with dry skin), and I wasn't really sure what kind to buy. We'll probably just be using it in our bedroom. I know that there are ones that are cool vs warm mist, but what's the adv/disadv for having either? We actually purchased one from Costco last year, but it didn't really work (didn't notice a difference, could never actually see the vapors emit from the machine---not sure why I didn't return it!!). Anyways, I wanted to buy a smaller one just for the room.