Keeping a chimney clean means a lot more than just using dry firewood. If you use a wood stove to heat your home more than once a week, you should really get yourself an EPA certified stove.
Most EPA certified stoves emit an average of around three to four grams of particulates per hour, compared to 20-40 grams for the uncertified wood stoves made before 1988.
Also, the EPA tells us that certified stoves are “50% more energy efficient” than uncertified stoves. This means, for example, that instead of burning wood at 50% efficiency, you could be getting 75% efficiency from your wood. Instead of sending smoke up your chimney, the most efficient stoves reburn the smoke before it goes up the pipe, either with secondary burn tubes or a catalytic converter. Smoke, after all, gives off plenty of heat because it has lots of Btus.