I have had this heater for about 3 weeks and on those cool mornings, it's been a blessing. It heats up my whole bedroom without my having to put the heat on for the whole apartment. Considering that it's a personal heater, it heats up a pretty big room. I can't wait to try it in the winter and even plan to put it in my camper this Fall for our annual camping trip. [This review was collected as part of a promotion.]