THE PROBLEM

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THE SOLUTION
At your local store buy some of these:

• 2 rolls of double-sided tape (About 7 € each)
• 6 to 8 cotton bags from your local supermarket.
• A ruler (if possible a 50 cm one).
• A cutter.
• A good pair of scissors.
• Foscurit. Foscurit is a gray plastic that does not let in any light (nor any wind)
• Spray paint. If it matchs the color of your window a lot better!
  OPTIONAL and only for Freaks: Plastic L’s . This is at the end to insulate the angles.

Good, now that you have all the materials you can put Hands At Work:

1. Cut the cotton in 2 cm vertical lines. Like you can see in this picture:
   
2. Put it inside the window horizontal holes
3. Mount it with the spray painting. From the 2 sides being the most important one the outside one (that where humidity and wind will get inside)
4. Fix the double-sided tipe on the window borders. This will be later used to mount the plastic foscurit:
   
5. Stick the foscurit over the double-sided tape.
6. The final touch. Touche! If you are a detail freak and you want even more insulation get some L plastic corners (you can get these in Leroy Merlin, I will ask them for comission later…) . You can stick those with silicon in the top and the bottom side of the window with the window closed.

Another video about insulating a window. Mine is much better insulation because reduces a lot more the noise!