I got this about 10 days ago and haven’t had the chance to use it yet because at this time California was not that cold but yesterday it suddenly became very cold and rainy so I brought it  to my workplace to use for my clients and I. In my workplace, whenever someone opens the door, the cold air goes inside and it takes a while to warm back up. The heater did its job amazingly well and kept both me and my clients very warm. My clients also liked it as well.