This product is terrible. We let it run for 4 hours and it did nothing for our house. We tried bringing it upstairs into our bedroom and see if maybe it was the size of our living room, but after an hour and a half in our 150sq ft bedroom, it did not even make a shift in the temperature. I ended up shutting it off and using our tiny space heater which had our room warmed in  20 minutes. Do not waste your money on this.