I had my chimney inspected and it was clean after about 2.5 cords in first year of this stove. I was just about out of well seasoned wood so I began to burn the best of the marginal wood I had. It is 9 month seasoned red oak that was dead standing but it really needs more time. It was a big hassle to hunt for the driest, poke it, split down, dry by the stove etc, and it I was worried about clogging my cap. For 2.5 weeks I burnt the marginal wood mixed with the very last of the good stuff. I was thinking about shutting it down for the year, but my neighbor and wood source told me that he had one seasoned cord that a customer never picked up. He said he would check with the gentlemen one more time and if it doesn't want it then it is mine. Well, I was able to pick 1 cord of 16 month seasoned ash and cherry on Saturday and I am burning well again. This should take me well into April. I also have at least 5.5 cords that will be ready for 2010/2011, so I should be burning well for a while.