We had Cool Zone Air Conditioning and Heating LLC come out and do a cleaning a couple of years back. Recently, we had a weird noise coming out of our unit and wanted to get the system checked and make sure everything was in working order. It all turned out perfect. They found out what the problem was and were able to give us tips on how to get it back to being quiet. It has been a very positive overall experience. They have knowledgeable staff, and it is very easy to make appointments at times that are convenient for us. They are very professional when they come to the house, and everything was smooth, efficient, and streamlined. I have actually already recommended them before, and I will continue to do so!