Our new construction house has R44 walls and R60 ceilings. The living space is 1,300 sqft including a loft for the bedroom and an attached shop that's 1,200sq ft with 16ft walls. Our question is how big of a stove to install and will heat all 2,500 sq ft and not cook us out. There is a door into the shop from the first and second floor that can be opened to heat it. We live in the mountains of Alaska with an average winter temps of about 10deg last years low was -30 for a week.