Medium 2,500 square feet up to 3,999 square feet – it may hold 4 or 5 bedrooms and two to three baths for the family of four with a guest room. It may be gas or electric heat, cook stove, hot water, and dryer. High ceilings will require more heat. The carbon footprint of this size home is smaller than a large home but still is large enough. However, by purchasing carbon credits you can reduce that footprint starting today.