I provide wood to a rental cottage on my farm and I never know how much the people who are renting it are going to use. Really throws me off. Some renters use hardly any others heat almost 100% with the wood I provide. 2-3 cords a year. That on top of the 6-8 I need adds up. I heat a slowly less drafty 2200 sq. ft.1810 farmhouse 100%. I guess I am just ranting because my current tenants are 100% ers which is good but throws me way off and I need to go scrounge some standing dead out of the woods today to make sure there is enough to burn at the end of the year.