A smaller chimney would likely draft much better. 8 inch stovepipe going into it. So 50sq inch opening into 75 -doesn't help. Plus, the chimney is offset halfway up. Far from ideal, but original to house built 1980... We don't even try to light it much above 40F. Really only a problem getting started. Had it burning 3 days straight about a week ago when it was colder and never used a drop of oil.