We have been using the heater for about 5 weeks now and its working as advertised. The heater is small and quiet, but it does produce ample heat. We are using the heater in our kitchen area (16X16) which also has 3 rooms off. Although those rooms do not receive much of an effect it does help. Also, we turn the furnace on in the morning to remove the overnight chill and then shut the furnace down for the rest of the day. Using this heater and a Life Smart in the living room works well for us. To date the temperature has not gone below 12F, so it remains to be seen how well it will perform below 0F and the Hawk blowing from the north.
LJA

PS.....We prefer the Dr. Heater over the Life Smart we purchased last year, as the Dr. Heater is more compact and emits more heat.