This is picking up on a couple of posts from October but I don't know if people look back that far! I have an Alderlea T-5--was installed in spring and have been trying to do this "shoulder season" burning efficiently but am inexperienced. I can start it up pretty quickly, get the flue temp up and be without smoke from the chimney within 10 minutes. I get the air down as much as possible and run it for a while on two or three good sized splits . I have been running in and out all day to see how the chimney does over the course of the burn. As the flue temp went to the "too low" section on the magnetic thermometer, smoke started coming out of the chimney--that was whether or not I gave it more air. At that point wood was still glowing, with intermittent flames. Now there is only coal type redness (although the splits have not completely fallen apart--and I can still produce a bit of flame if I increase the air) and no smoke from chimney. So is it normal to have smoke at the tail end of a burn and is there a correlation between amount of smoke and creosote buildup? I am trying to find a balance between efficiency and not making the place boiling hot.