Hello Fellow wood burners. We just started using a wood stove to heat our house this winter. I have never used a wood stove before and do not know very much about the technical aspects. Well, its been really cold here in Montana and we have burned for about a week and a half straight. Yesterday I was outside shoveling snow and looked at our furnace pipe. It has brown streaks running down the sides. I am afraid that this is creosote build-up caused by: Not burning the fire hot enough and using green wood. The fella that sold us the wood said that it was seasoned, but the bark does not come off the sides and there really is no cracking at the ends. I have called a chimney cleaner and he may come out this afternoon. I am not going to burn again until I find out if the wood is dry. I may also not be letting the stove get hot enough. I am using a magnetic thermometer at get the fire around 300-350. Any advice would be very helpful. And I am glad to have found this site!