Installation department. When called because was very upset with the installers they sent. All 4 people I talked to were very nice and understanding. Then finally a guy was sent out to our house to find out what problem was. Again nice and understanding. He asked and again I repeated what I told Four other people, he took a lot of pictures. But in the end no one cared. Received an email weeks after the guy left our house with his answers and pictures, asking me to send pictures and send a detailed list of what was wrong. To send pictures and write what problem was not happening I told 5 people including manager at Lowe's, who really did not care. I was not going to explain it all again and take more pictures,which the guy who came out took a lot of. Then at the end of the email we were sent it said do not respond to this email, it will go no where. Completely useless. They won because I had enough I have given up. I will never use or recommend Lowe's for any installs ever again.