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I wish I could remember where I saw this but, here goes (from memory)
The optimum compass direction for a house is facing N.E. Back of house would be S.W.
Generally, the most "windowed" area of the house is the back. In the winter when the sun is low to the southern horizion, you get optimal exposure and "heat gain". During the summer with the sun more overhead you have less "heat gain". You can also reinforce that winter heat gain with a large stone/concrete interior wall that is exposed to the sun during the day. Then at night it gives back by radiating off the heat. Also for winter protection- check for the direction of prevailing winds and create a buffer with large volumous evergreen trees.
Also, to further enhance the summer effects- use a wider than normal soffit, to further shade the windows. I'd probably stay away from vaulted/ 2 story rooms- to improve the efficiency of the mechanical systems.
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