posted 8 years ago
Everything I'm saying below is for the Northern Hemisphere. N and S are opposite in the Southern hemisphere.
The beauty of exactly south-facing windows is that the sun goes almost overhead in the summer, so it doesn't shine into south-facing windows at all in summer, especially if you have a few inches of overhand above the windows. The same windows get the most sun in winter when the sun travel lower in the southern sky.
East, North and West windows get sun in summer, but much less in winter. So they tend to cause overheating in summer and heat loss in winter.
West windows tend to cause uncomfortable overheating, because the rooms are already warm from the day and then they get blasted by afternoon low sun shining deep into the room.
In summer the sun rises in the NE and sets in the NW, travelng for several hours and shining deep into E and W facing windows. For the same reason, the sun shines a little on the north wall in the morning and afternoon, but only in summer. In the winter, the sun rises in the SE , travels low in the S sky (well, lower than summer), and sets in the SW, so in winter, a N window gets no sun at all, and the E and W get less sun than they do in summer.
So in a hot climate your best bet to staying naturally cool is exactly south facing windows with an overhang above them of several inches, and some E facing windows. Avoid W facing windows, or plant trees outside them. The N side is a great place for a veranda to enjoy the cool shade in summer.
Works at a residential alternative high school in the Himalayas SECMOL.org . "Back home" is Cape Cod, E Coast USA.