I live in sunny New Mexico and am doing research for having my windows replaced. I'm torn on the question of whether I want low solar heat gain coefficient (SHGC) windows, though. My house faces east-west with only two small windows on the south side (definitely going LoE with these). Most of the windows are east or west, and these windows cause the house to gain undesirable amounts of solar heat in the summer, especially a large west-facing picture window which just gets scorching hot. The east and west windows are semi-shaded, but still let in a lot of direct sunlight. However, they also let in a lot of desirable solar heat in the winter when the sun is lower and gets under the shading more.
So I don't know if I should be spending more for the fanciest LoE coating available for these east and west windows. On one hand, it seems like it would help with summer overheating, but if it's going to block an equal amount of desirable winter solar gain, what's the point? Would I be better off getting less LoE and putting up adjustable blinds or something?