Bought this unit to replace the unit that I had because when the compresser kicked in, the vibration was horrendous. Five old wooden double hung windows shook, ratteled and rolled. The LG unit is nice and quiet. The room has a total of 7 windows and get full sun morning to abour 2 pm in the afternoon. I'm happy I got the 8000 btu model. Having a July Heat Wave and this AC keeps the room cool. I am very happy with the unit.