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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).

picture of my window from the outside

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.

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    Transparent sheet like perspex - cut to fit.
    – Solar Mike
    Jun 25 at 18:13
  • Regarding irreversible, can you confirm that's a double hung sash, the top window is operable, it lowers enough to completely expose the recess in the bars, and your new unit will fit in that recess?
    – jay613
    Jun 25 at 18:18
  • Regarding transparent: the area below the A/C, i.e. the entire bottom window and the part of the top window below the recess, will remain transparent. There is very little space to the sides of the A/C and above it. Those are most easily filled with wood, foam, etc. Please confirm it's not essential to you that those narrow gaps be transparent?
    – jay613
    Jun 25 at 18:20
  • @jay613 yes, double hung sash, top window opens (though when it is open the bottom window's screen is no longer sealed on 4 sides. Jun 25 at 18:34
  • The window is someting like twice the width of the window, so I'm not sure I buy that there is "very little space" to the left and the right - it's not essential per se but it would be nice. Jun 25 at 18:35
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Use custom picture frames to fill the larger gaps on the sides of the A/C

Position the A/C to be sandwiched firmly between the top of the window frame and the sash. It looks possible. If there is a gap between the top of the frame and the top of the A/C, try raising the A/C on shims (eg strips of wood placed on the bottom of the metal cage) so the A/C is firmly against the top of the window frame while resting on the cage. Then push the sash up against it. Prop up the sash from underneath with pieces of wood.

Seal top and bottom Then use foam strips (they sell these for just this purpose) to seal the open gaps both top and bottom between the glass of one sash and the frame of the other. If you only seal one gap the inner space becomes very dirty. Forget about the screen. The seal should be formed between the two sashes and the foam strips you place between them.

Seal sides transparently If the A/C has plastic side baffles, remove them. Now you have a small gap on each side of the A/C. Measure them, go to a picture framer, and have them custom-build a pair of frames using a simple square-profile wooden frame and a heavy glass. Screw each of those to the A/C using the holes from the baffles that you removed (you’ll need longer screws). Screw the picture frame to the window frame on the opposite side (the only permanent damage you’ll do). Seal with something non-permanent like white electrician’s tape.

If possible remove and store screen You can't open this window now, so to increase light you can, if possible, remove the screen entirely and store it.

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Plexiglas and pipe insulation.

pipe insulation

  1. Put AC in niche.

  2. Measure spaces around it as rectangles.

  3. Get plexiglas sheet. Maybe they will cut it at the store for you. Hopefully they will. Or you can cut it which is work. Cut rectangles the size of spaces you need.

  4. Get pipe insulation. They are foam tubes cut along one side. They are cheap. Some depicted above.

  5. Cut pipe insulation pieces to slide onto the 4 edges of each of your plexiglas rectangles.

  6. Push rectangles into place around AC. The pipe insulation will insure a snug fit.

  7. Glare balefully through transparent plexiglas. Optional.

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