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Unfortunately you need 13 in regardless of if you are installing it from the inside or from the outside.
Sorry, there was a problem. Please try again later.To install this great air conditioner, you will need a minimum height opening of 13". You might check your specific window style to see if the lower portion of your window can be removed. If so, remove the window, install the air conditioner, and reinstall the window. A cool, comfortable summer may be in your future!
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