I know it has not been extremely cold yet, (28 last night, low 30's a few others) but I have only had my heater on the 2nd setting and it has been about 68 degrees in my house. Last year I had to have it on the 4th or 5th setting just to get it warm in here. I don't know what I did but something worked...( cleaning, grinding, pellets, new windows) now I have to figure out how to push some heat to my upstairs..
