....as a few of the other replies have suggested the issue is probably psychological rather than real, there is no way that your gear is producing anything other than minimal noise and your unlikely to make it any quieter.
....time to get the psychoanalysis couch out and try and work out the cause of the problem. It could be they just don't like the thought of someone out there while they sleep.... a myriad of possible causes but you will need to address them if you want to keep good relations and not get a 1kw security light pointed in your direction...
.... certainly have a talk and try to establish the root cause..
....but in my experience it is desirable to use a 'hide' or screen so that they are unaware of when you may be imaging, if they can't see you it may reduce the irritation factor.