Our two story family room stays constantly cold in the winter. The house is about 2400 square feet and has a single heating unit for both floors. It has natural gas heat. We use a small space heayer but it does not help much. I don't know if it's a design problem, with the small balcony allowing the heat to escape or possibly the lack of a ceiling fan, or even the need for new windows and/or patio door. Possibly all 3. We are freezing! Can you please help?