We’ve had this unit for 1.5 years now. The first summer it was in our living room and from day one had a loud, low-pitch vibration when the room had cooled down and the unit was drawing less electricity. My local retailer offered to take it back, but said it would go in the trash. I didn’t want more e-waste. So I kept it. I wondered if it was my wood window frame causing the issue. This unit is very, very heavy. I got a support bracket for it but it’s still loud. This season I moved it to another room, away from where we primarily spend time and it’s no longer an annoyance. The fan is quiet, and when the unit is calling for compressor use it is also quiet. It’s energy efficient, and it’s really great to be able to track energy usage in the LG app. I just wish it didn’t have that horrible hum.