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Thread: Window a/c in casement window??

  1. #1
    Join Date
    Sep 2006
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    Shenandoah Valley in Virginia
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    Window a/c in casement window??

    I have casement windows (Anderson) (2'w 4'h)..
    Need to install a 5000btu window a/c.
    Going to remove sash, make 3/4 plywood to fit on inside with a hole cut for the a/c unit.
    Any suggestions on how to make outside weatherproof and look decent ??
    Do not want to damage the vinyl, etc..

    Any help appreciated.
    Thanks.

  2. #2
    Join Date
    Nov 2021
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    Columbia MO and Howard County MO
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    I might think of trying Plexiglass and clear silicone caulk rather than plywood?
    Best Regards, Maurice

  3. #3
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    The clear plastic is a good idea, but you should use polycarbonate (Lexan) which won't crack. PVC lumber and trim are readily available in home store to make a surrounding framework. And, assuming you would remove this setup for your colder season I would use closed cell foam for sealing instead of caulk.

  4. #4
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    It would take very heavy plexiglass or lexan to support the a/c...
    The top of the a/c wants to go push out and the bottom wants to push in..
    Last edited by Ed Aumiller; 05-16-2022 at 8:38 AM.

  5. #5
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    Since it sounds like you are eliminating the glass entirely, consider building a thin "wall" rather than just using a single panel. It will better support the weight of the AC unit and you can also insulate hollow areas with foam board insulation. The outside layer should be a weatherproof panel or if a wood material, be properly primed and painted. Provisions for flashing to guide water runoff are also advised. The thin wall can be a "sandwich" with the whole window frame defining the core thickness.
    --

    The most expensive tool is the one you buy "cheaply" and often...

  6. #6
    Could you install a mini-split instead? Just some holes for refrigerant tubing and power.

  7. #7
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    Installing it through the wall might well be easier.

  8. #8
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    I agree with John Ziebron about Lexan as it has replaced Plexiglass and is superior. Window units are a drag, but sometimes they are the cooling solution that can happen quickly and relatively cheaply (in the short term).
    Best Regards, Maurice

  9. #9
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    southeast Michigan
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    I lived in a house with a boiler and casement windows for many years so the only option at that time was window A/C units which were only put in for the summer. I made shelves that sat on the bottom of the window opening with the A/C unit then sitting on the shelf. A lower lip on the front bottom of the shelf prevented it from moving out when you slid the unit on it. The part of the shelf extending outside had a couple of triangles underneath to brace it up since the bulk of the weight is hanging out there. The Lexan piece was the same size as the screen with a cutout at the bottom to account for the A/C unit. I used the same threaded holes that held the screen to hold the plastic piece. Closed cell foam was used in places where there were gaps.

  10. #10
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    I imagine something like John did for the Lexan, With clear only above the unit, You could make a short, "summer" sash, and even use insulated glass.
    I have one of mine in already this year, and another one still to do. Hopefully a two zone mini-split is in our future.
    Best Regards, Maurice

  11. #11
    Join Date
    Mar 2010
    Location
    Phoenix, AZ
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    229
    I used one of the casement window A/C units for years. I opened the window all the way, built a wood frame to hold the unit with some plexiglass as fill in above. I then taped the seal between my frame and the sliding window. It worked great for the 10+ years I used it.

    https://www.homedepot.com/p/Frigidai...22SE/312549549

  12. #12
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    Sep 2006
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    Found a small a/c that would fit with window cranked open.. Made small shelf for outside part, put cross brace to hold top & put plexiglass above it...

    Did not know they made an a/c unit for sliding windows.. Wonder how it mounts in a casement window?? Will stop by home depot & check, just curious.

    Thanks for all ideas...
    Last edited by Ed Aumiller; 05-27-2022 at 6:20 PM.

  13. #13
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    Nov 2021
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    Columbia MO and Howard County MO
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    I take mine out as soon as weather permits. This thread is sounding like leaving it in is the goal? The AC guy I learned from likes the Friedrich brand.
    Best Regards, Maurice

  14. #14
    Join Date
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    New Westminster BC
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    This video from Matthias Wandel might help. https://www.youtube.com/watch?v=-h5b57ZxQQI

  15. #15
    Join Date
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    Modesto, CA, USA
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    A small mini split can be had for under $500. 20-50% More efficient, quieter etc. Some can be 120 volt plug into a wall outlet inside the room. The Friedrich brand can be more then 50% quieter then others. The Db sound scale is logrithmic
    Bill D

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