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Q.

How to Install Air Conditioner without Damaging Window?

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0 2026-02-23T10:28:50+00:00

This all about how to install air conditioner without damaging window,

  1. Measure the height and width of your window. Ensure the AC is properly fitted. An incorrect size can damage the frame.

  2. Set up an external air conditioning support bracket. This relieves pressure on the window frame and avoids cracks or warping.

  3. Insert foam padding or rubber insulation between the air conditioner and the window frame. This protects against scratches and pressure damage.

  4. With assistance from someone else, carefully set the AC on the bracket and push it into place. Refrain from pushing it into the window.

  5. Close the window sash firmly over the AC. Use screws only where required and avoid over-tightening, as this can crack wooden or UPVC frames.

  6. Use expandable foam panels or weather stripping to seal side gaps. Do not use heavy adhesives that can damage paint or polish.

  7. Ensure the AC tilts slightly outward for proper water drainage. Confirm it is stable and not shaking.

For best results, consider professional installation to prevent structural damage.

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We recently purchased a window AC and got it installed by an AC technician. At first, we thought of doing it by ourselves, but I was afraid to damage the window. So, I’d say it’s best to leave this all to a professional. However, when I saw the technician installing the AC, I fairly understood how to install air conditioner without damaging window. Let me share the process.

How to Install Window AC without Damaging Window?

I learned that the most important thing is the usage of support brackets, which keep the AC intact and will not damage the window as well. I am sharing the steps that the professional took while installing the AC.

  1. He took the measurements first. You can measure the height and width of the window to figure out how to mount the unit properly.

  2. Inspect the window to check for any previous damage. If the window is too weak to handle the weight of the unit, you may have to repair it first.

  3. Once everything was in place, he set the AC unit carefully in the window and attached panels and support brackets to secure it properly.

  4. Finally, he filled in the gaps with weather strips. I remember the technician mentioning that although optional, weather strips are a great way to protect the window from scratches and warping damage. 

These are a few steps he took to install the window AC. To make sure you don’t damage your window, you should be careful about two things: measurements and attaching brackets. 

I hope this helps.

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