Trellises and living things- plants and animals can create shade on a bank of east, west of south facing windows. This solves a whole other esthetics issue. It puts gloves on your hands and your fingers in the dirt, and you get to pick flowers and eat vegetables. Imagine big tomato plants on a trellis and you keep them growing up vertically to shade your window… check out radical gardening ideas here.
This does not aire seal your window