I'm looking to possible purchase the st. croix pellet stove which is 35,000 btu. Is this enough for 1650sq ft, without it constantly running on high? I have replacement windows and just purchased insulated window treatments for upstairs. The pellet stove will be in downstairs family room. Downtairs is about 550 sq ft and upstairs is 1100 sq ft. I also have a heated garage but I keep it at about 45 to 50 degrees (500 sq feet)