Hot hot summer is creeping in soon here in Japan.  My apartment is always bright and nice, but the heat from the windows will be unbearable soon.  I hadn’t been able to spend any time for this problem since I moved in here, and finally I got an idea for this one particular window that gets deadly afternoon sun in summer. 
I used some cheap insulation sheets, cut holes in them, and attached to the window with tape. Doesn’t it give you some beach feel or what?? 🙂 haha. It looks funny a bit from outside, but it does    block sun light quite well.