So far it's working really well. Keeps the house at a steady 72. One thing I have noticed on the overnight fires is there isn't much left by morning.. usually enough coals to get a fire going again but the house temp. has dropped a few degrees by then. It seams to be burning pretty clean, I think that afterburner set up they have works well. The only problem I am having is with my ductwork... I don't think we have it sized right, but that really has nothing to do with the furnace. Hope this helps.. any other questions feel free to ask or you can call the factory too. I think they have their 800 number on the website, if they don't let me know and I'll get you number for them. I talked to Keith quite a bit before buying mine, he knows his stuff!