Threw a few logs on the stove at 9 p.m, and shut it down completely. We had 29 degree temps last night. Shop was 60 degrees at 6:30 this morning. I see I can't damp the stove down all the way. There were still a lot of coals, and simmering logs. No flame, and it made quite a bit of creosote. I'll try letting more air in tonight, but I'm amazed that 3 or 4 logs simmered for over 9 hours!