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Risk of harmonic noise for Mitsubishi split outdoor unit
I'm in process of finalizing an install for a ductless heat pump system. For my master bedroom, the indoor unit needs to be connected to a dedicated outdoor unit (MUY-GL09NA). If that outdoor unit were to be placed on the ground, it could only go adjacent to another outdoor unit serving our kitchen, and that's too much of an eyesore in our backyard for my wife and I to stomach. So the installer can put it on a wall bracket in the back of the bedroom above a mini roof where it would be mostly out of sight. But he's cautioned more than once that there is a 'chance' (not sure of percentages) that there could be some discernible harmonic noise (not sure how loud). I'm not worried about any noise outside, but I'd be concerned about any bothersome noise inside (although hopefully it's white noise...and we'd only run the unit while sleeping at night). Does anybody have any direct experience with this harmonic noise? And there's truly nothing that can be done to mitigate the noise? For example, I found this link.... http://www.kellettent.com/blog/keeping-vibration-off-the-wall-with-mini-split-hvac/