Much quieter than best made traditional window AC in low mode, similar noise in high mode. However the right way is to turn on low mode forever unless it's very hot. Feel the benefit of inverter. My place electricity is expensive because of delivery fee... so it's good for me.
I bought at a good deal. After 89.99 shipping fee, still very attractive. I want to replace old window AC in living room. Because that windows has a heat radiator with steam, I have to take off AC every year (otherwise hot air will cause a lot of trouble to AC). So easy installation is very importantly to me. Otherwise I would have bought U-shape AC (I already have one), which is extremely quite like wall AC as compressor is outside of window. It also comes with a free well designed support bracket.
However, the installation experience is bad... Not sure how designer thought back to old time... This AC unit has an extra thicker "butt" than normal window AC. It sits well on support bracket.
It is critical AC tilts outwards slightly so condensate water in door can flow outside to chill rediators. Without this mechanics, bill at doubles in warm days and triples in hot days. Water drops indoor when the plate is full. In manual also mentioned that angle tilting outside (0 to 4 degree). Because of the thick butt, it's tilting inwards, that's so ugly.
I have to reinstall support bracket, loosen skews so it's like joint connection. I have to put some cardboard below. Then there's a small gap at bottom to fill with foam...
Anyway it is clearance. No complain as long as it works.