I'm amazed at what a bit of a difference in temp can do with regards to the stove burning. This weekend it was cold in So. VT..single digits Saturday...-0 with the wind. The Jotul chugged along great though! It seemed that it didn't take as long for new splits to light off and I could back the air control down sooner. It warmed up to the 20's on Sunday. After getting back from skiing...I had the downstairs up to 74F.