I think you and the article are in agreement - they said: "If possible, the longer axis of the building, also known as the ridge line, should be oriented east/w

I think you and the article are in agreement - they said: "If possible, the longer axis of the building, also known as the ridge line, should be oriented east/west." And you said facing north/south. I agree about the roof. Reflective metal roofs are gaining popularity here, and last a long time (50 year guarantee), but also cost more. Something that is found in high-end/custom homes is a conditioned attic space, with the majority of the insulation under the roof, and not directly above the ceiling of the living space. If you can keep the inside of attic below 100F, the relatively thin insulation on the air conditioning ducts will be more effective. Again, it costs more to get this benefit...