it's meant to be temporary and easily replaceable, the idea is to put it up during the summer so it blocks most radiate heating of the building, and then take it down throughout the rest of the year so you can still get a good view out the window.

I could also do dedicated window awnings, or retractable ones, but that's not my style. But yeah you have a good point. I was thinking about a different kind of awning initially lol.