All the more reason to get cracking on installing central wood heat! Anyway, sitting in the living room I noticed a strong smell of fuel oil and went down to the basement to investigate. Once I turned the lights on I noticed a very fine haze hanging in the air. This is probably only the second time we've used the heat this year, and we just bought the house in June. I called the company that had installed the unit and the guy came out and quickly determined that the chimney was not drafting properly. We were able to get it to draft by holding the butterfly at the base closed and running the furnace. At first with the draft open just a bit, hot gases were blowing out forcefully into the basement. Also, when the tech pulled the pipe from the wall there was quite a bit of loose soot in the bottom. Once we forced the butterfly closed the chimney began to draft. However, he recommended we get a chimney company out to take a look. From all outward appearances the chimney looks fine. It's a masonry chimney (12" x 12" block) with an intact parge coat and cap/screen. I'm going to try to get up on the roof tomorrow to take a closer look at the cap to see if there are any breaks in it where a bird could have gotten inside or something of that nature. I also thought about putting a mirror at the base of the chimney and then shining a flashlight from the top to see if I can find any problems-what should I be looking for? The tech guessed that a tile could have come loose inside and was obstructing airflow-if this is the case would I be looking at relining? How much does something like that usually cost? Would there be any reason I would need an entirely new chimney? If so, is there anything I should keep in mind for the new one given that I would like to install an add-on wood furnace soon? Thanks!