90% of the problem with window shakers is the window that they are installed in is loss in the frame. When the unit is installed in the window you need to make sure that you install vibration eliminaters. This can be as simple as placing the foam strips between the unit and the bottom of the window you raised to install the unit through or as complex as removing the unit from its casing and reinstalling the casing, making sure all parts that touch the raised window as well as the side extensions have a cushion between them. If the clatter persists gently tap on the sash to see if you get any vibration, if so you need to insert slivers of wood between the sash and the moulding. This should solve you problem. The only thing you should hear is the compressor going on and off and the whosh of the fan.
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Does it sound like it could be a fan blade striking the housing? Charlie
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