You could put Styrofoam sheets in the window. Make them the same size as the whole window opening so that any space is covered. Don't go real thin or it may not muffle the noise. You can hang a curtain or something over it to hide it.
There are also several commercial products available. Use your search engine and type in ' how to sound proof a window'. The commercial ideas should come up.
We have put in a new AC, however in the afternoon this room is still HOT. There are wooden blinds on the windows. I am thinking of putting a sun block film on them. A...
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Styrofoam board cut to fit in the window. i put batting and fabric over the room side.
You could put Styrofoam sheets in the window. Make them the same size as the whole window opening so that any space is covered. Don't go real thin or it may not muffle the noise. You can hang a curtain or something over it to hide it.
Good suggestions
Heavy lined blackout curtains help too.
https://removeandreplace.com/2014/12/02/how-to-soundproof-a-window-and-block-noise/
Here's one way using carpeting
https://removeandreplace.com/2014/12/02/how-to-soundproof-a-window-and-block-noise/
There are also several commercial products available. Use your search engine and type in ' how to sound proof a window'. The commercial ideas should come up.
I have seen people use bubblewrap.