Sunscreen in front of the window
The windows of my living room are on the south side. And nobody wants to have 30 degrees in the room during the summer.
So I bought 2 cheap white beaver sheets (their surface is a bit rough, so it sticks to the velcro) and they cut to window size, plus 5 cm on all sides, cut to size.
Subsequently, inside the window frame, all around, small strips were velcro, rough side, glued. Then the sheets attached and windows closed. Finished!
Even at 40 degrees outside temperature, I have a maximum of 27 degrees in the room and that helps a lot. Buy now 
Homein Sunscreen Self-Adhesive Bright Silver 76 x 300 cm, Mirror Film Sunscreen Hitzesch? 25,99 ?
