Yes, I heard this on NPR many years ago, someone had a "steamer" that you put your face in that kept the temperature at the right heat to kill most of the virus, which apparently makes their headquarters in your nasal/sinus area. I started using one of the travel steamers way back then (about 1985 or so) and it made colds/flu go away in record time. Do have to take care not to scald yourself. It mimics the old-fashioned way of treating colds by heating a pot of water and leaning over it with a towel over your head to breathe in the steam.