The house here is NOT designed to heat with wood. The fireplace is on the East side of the house, the master bedroom is on the West as is the bathroom. There is a forced air, natural gas furnace, but the duct work is single walled galvanized metal and it runs through the crawlspace. I can have the living room/dining room at 80 degrees in single digit ambient temps and the master bedroom is in the low to mid 50's. Running the blower motor on the forced air furnace kinds defeats the purpose of burning wood. This place is an old farmhouse and even with 7 foot ceilings it's impossible to get any sort of even heating in the house. I do save on a lot of the heating bills though. I have an electric blanket on the bed and can run the furnace even on just "fan" if the other rooms get too cold, it will bring them up 10 degrees in temp.
Just for a test, I let the fire burn low enough that the t-stat that kicks on the insert fan turned itself off. I then ran the furnace to get the house to 74°F. The bedroom was still 8°F colder than the living/dining room.