I've honestly never noticed an annoying loud refrigerator in a hotel room.

Stayed in plenty of cheap motels that had crappy window A/C units that sounded like a jet engine at close range. The problem is, I like to sleep in a cold room. So I'm going to have to use it to some extent...whether I can set it on a bone-chilling setting in the evening and then turn it off right at bedtime kind of depends on where I am.

Winters are nice, because I can usually get by with no HVAC at all, especially if I can crack a window. (It seems like hotels are always naturally warm...I've literally been in hotels where it's snowing out and I sleep with the windows open.)