Sir, I am heating about the same Sq footage that you are. I estimate that I have used 4 cords or maybe a little less. Fired up my furnace Nov. 4th. We have had the worst winter in several decades here both in duration of low-cold temps-10 to 20 deg. , and lots of snow. I have used a minimum of dry wood, just enough to keep the green wood burning, mostly white,red,chestnut oak with some hickory and locust mixed in. I burn extremely large chunks 24-30 inch length 12-18 dia. The furnace is a woodmaster 4400, has a large burn chamber. My heating cost have dropped expotentially. If I don,t count my labor. I live on a small farm and have my own woodlot. If my health holds, so that I can cut wood and operate the unit, it should pay for itself in three winters use.