I always like to use this space heater, especially during the cold times. I recently used this heater last week, and it warmed up my whole room in about four hours! It's usually very cold in my room, but with this heater, it can really make a big difference. Although the heat does diffuse throughout the air slowly, it does get the job done of keeping a person warm and toasty. The fan also cuts itself off sometimes (because of being overheated) and will turn back on by itself in a matter of minutes. It can be used at 750 wattage, or up to 1500 wattage of power, but I do not recommend using the 1500 wattage switch on the heater because then it will create a burning smell (even if nothing is by the heater) and will probably overheat much faster. It's also safe to turn the heater completely off (or unplugged) before leaving the house because it can use up power, especially if you're gone for hours, but this heater is the best, especially if you need to be warmed up quick from the cold.