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The 24K BTU window unit I have in my office (it actually sits in a specially constructed box that was made for the glassblock windows) was listed as being "Library Quiet" ... which it became only after a LOT of shimming. The units have to be very well secured in the window in order not to vibrate in a loud and annoying way. It might be your windowframe vibrating rather than the unit itself causing the additional noise.
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