This morning when I woke was around 32* outside. My wife and I wouldn't be home so I loaded the woodfurnace with some dense hickory splits about 16-18" long at 5:00 am. When I got home at 2:30 pm the woodfurnace had a large pile of glowing coals with the blower still cycling. I didn't touch the fire because it was in the mid 50's today. Fast forward to 9:30pm tonight I went downstairs to check the furnace, it's dropping to 38* tonight. I removed the ash grate cover and removed the ash from the furnace and opened the damper. Half the coals were glowing and the other half out. There was around a couple gallon of coals. After raking them forward within 10 minutes there were enough hot coals to load full splits which took right off. Here is a pic after 17 hours, not too shabby. I've always had coals hours after a fire, but this was the best I've seen.