New member and need some advise from experienced users. I have an open floor plan two story home. Bottom floor 1100 sq ft and upstair just under 700. We have an avalon arbor(45,000 BTU ) in the living room which heats entire house only problem is that we get soot on our walls and window sills which could be from us adding corn to the mixture. We use just about 3 tons of pellets starting late October- to end of March. I have had this stove for two years. It came with the house that we purchased in upstate NY. The heat from the living room travel upstairs and heats it nice and toasty. I just want to upgrade to something that is more efficient and will handle better when temp falls below -10 to -20 at night. Will the Harman P61A be a big noticable difference that the avalon arbor. Any suggestions? FYI our living room reaches a temp range of 79-83 with stove on first medium when it is in the 30"s. If I choose to purchase this stove how should I set it to keep my above temp range?