Noise is too loud is totally subjective. I like the white noise suggestion have found a small
battery powered fan to be a useful aid to catching a nap in a rest area. I figure if a noise is close enough to be a possible threat the dog will alert to it well before I would. Not sleeping to the dog "on alert".
Given a choice between AC and hot sticky night trying to sleep I'll deal with the noise. Having fed presses that were actually as loud as a jet engine taking off at peak impact noise I don't find any AC that loud. Window unit in the next room can bug my sister. She used front AC on her camper with a fan to blow toward the bedroom so the rear AC didn't need to be on.
However if one has to replace a unit less noise is certainly a good feature to pursue. The AC units in the closet or under a cabinet where very much superior in my opinion. They could be replaced with a $100 window shaker unit form a big box store when they failed and noise was very low. Did lose the storage space.
Might it be worth hitting a
rally and getting a chance to hear some other AC units in action?