#5 Square house. Houses lose heat through the exterior doors walls and ceilings (and through the floors in the case of mobile homes), so it only makes sense that by reducing the surface area of the building that heating costs will be reduced as well. Although a geodesic dome offers the least amount of surface area per square foot of usable floor space, square building are much cheaper to build and are generally more functional and aesthetically pleasing.
The trouble with square buildings is they often look plain and boxlike. Often house designers will add bay windows, turrets and dormers to give a home an individual touch. Not only do these attributes cost big money to install but these also add large amounts of surface area without significantly increasing the amount of usable interior floor space. The best way to fancy up an everyday is to attach unheated structures such as porches, decks and vestibules.