As noted in my review title I installed the first unit but then it was making a really loud noise (way worse than my former regular type AC). I reached out to customer service, who were excellent (I sent them videos and they agreed something wasn't right), and totally on top of everything. I did need to rebox the unit (at 70lbs no easy task) but Windmill sent a shipping label and arranged to have FedEx come to my home to pick it up, which was great, and sent a replacement unit that came very quickly. The replacement unit works very well - it is very quiet as advertised (not silent, that's not possible), but sometimes I do actually forget its on when walking in from another room. So very happy with the replacement unit! One note, unlike other A/Cs, this unit does seem more "precious" or prone to damage, so you need to really handle it carefully to ensure it functions properly, but overall, very happy with the upgrade, and still very happy I went with Windmill!