Hi Alex, I re-read your first post about hooking up your Pocono stoker. There were several suggestions made there.Leisure Line Pocono to heat whole house - tips, advice
In the above post [this page] you mention that you have arranged fans so that you cooled down the basement [moved the trapped heat upstairs] but have little apprecialbe heat on the main level.
I'm begining to think that with the really cold weather, you just don't have enough BTU's from your stoker to keep up with the heat loss of your house. If you have the stove really cranking, the burner bed is full of burning coal, and burning coals are near to dropping off the end of the burner bed, the heat is going upstairs, and the basement is cool [no heat trapped downstairs] Then the stove is doing all it can.
With a wind, a few spots of infiltrating really cold air, a 90K stove is not going to keep up with the heat demand. In a really tight house, of ~2000sqft, 90K will chase you out of the place. But not with leaks and poor insulation. I know all about leaks and poor insulation in my wreck of a farmhouse!!
In your original post, you mentioned another heat source on the main floor, is this hooked to a chimney?? Id the room air blocked from going up this chimney?? an open damper will exhaust a huge amount of heat from a house to the outdoors!!