coldcoal wrote: My plan was get the chimney sweeper in next fall, is more than once a year needed with coal? I read a lot about flyash, ain't seen any yet.
If you stick with the coal there probably won't be anything left for him to clean out, as I mentioned this will dry the creosote out and it will fall off the chimney flue wall. You really should get them here now if you haven't had the chimney swept in a while and if you don;t you need to be very careful to monitor the thimble area to make sure it doesn't get blocked.
Long term you really don't need to have the chimney cleaned anymore, maybe not such a bad idea every ten years or so if it makes you feel safer and don't want to do it yourself. Inspection is more important. The ash will settle only on the horizontal sections of pipe. Set it up right and you don't even have to remove the pipe* and can easily check how much fly ash you have. Take this setup for example:
The t with cap on the right end and the cap on the left end gives you access to both horizontal runs of the pipe. Just open them and use the hose from a shop vac to suck it out. The only thing I see missing here is a cleanout below the thimble which is where most of the ash will accumulate because of the long upward length of the chimney itself. A cleanout is preferable since most of the volume is going to be there it will provide a lot of extra space for it.
*You will want to remove the pipe completely at the end of the season. Wash it down with some baking soda and water to neutralize the acids. Leave them in a dry place if possible until next year. You can wash the inside of the stove with same solution and leave the doors open to keep it as dry as possible.