I recently acquired a new air conditioner, the Midea U, with dreams of a room both quiet and cold. However, when I went to install it, I found that it is too deep for the window I normally put my air conditioner in - the bars on the outside prevent the outside-the-window part from getting too far out the window.
There is a place in my window where the bars are set back, possibly intended for if one wanted to install a large air conditioner (top middle, highlighted on the image below).
However, if I put the air conditioner there, there will be a large gap above and to the left and right of it. I would like this area to be transparent so I can continue having a window, and I would like it to be at least somewhat soundproof, as there is a construction trailer with loud A/C units on it across the street. What can I do to seal off the rest of this area?
I rent, so no irreversible solutions. It's okay if it's expensive if it works well.