A neighbor has asked me to drop 7 trees in his yard, all 20" to 28" at the stump. There are 4 Ash, 2 Black Walnut and 1 Butternut. The Walnuts are going to my frriends' band mill, for sure. The question is, are the Ash, and the limbs form the walnut and butternut any good for firewood????? I admit I am spoiled for firewood, I usually only take Oaks and Cherry. I burned some ash one time before, and it seemed to make a lot of ashes, and was not impressed with the amount of heat. Thanks in advance.