I think my husband figured it out once and we are burning about 20 tons per winter. He likes it a bit cooler than I do but keeps it warmer for me. We have one old growth oak on the ground right now waiting for the weather to turn and the pasture to dry out so we can start harvesting it. It Succumbed to oak wilt last summer, which made me sad as it was a beautiful rambling white oak tree.
So we start in spring as soon as conditions permit and hope to have all of the wood to the barn, split, and piled by the end of June but we ran late this past year due to a very wet spring.
We usually drop two or three large trees to thin out the timber and then top off with dead fall. It's a lot of work but when we are done it gives you a real feeling of accomplishment.