A:Answer When you have the A.C. mode turned on I'd rate it a whopping 2. It's pretty loud but it gets the job done pretty well. I don't expect an Air conditioning unit to be quiet, especially one that works efficiently with 14,000 BTU. If you're just running the fan I'd say it's about a 4. If you're like me, I don't mind the sound. I sleep through it but if noise is an issue I would not get this. It's loud.