We bought this from a reputable appliance company and wish we had gone with another air conditioner. Literally, within one hour of running it, the unit started vibrating LOUDLY. It was so bad it shook a picture off of the wall and I could hear it kicking on and off from the floor below. The company we bought it from came out to check the unit and our installation. They determined we installed the unit properly but there was a problem with the compressor, which was why it was vibrating so badly. The company issued us a replacement of no charge and we went with a different air conditioner.