This humidifier is almost silent. It works flawlessly to put moisture into the air. My eyes, which are extremely dry, feel better in the morning when the humidifier runs overnight. Plus, as an added bonus the 5 function humidifier has a blue night light. Just a note from someone who didn't read the instructions first. Get a plastic place mat and place it underneath the humidifier. Nothing gets any moisture on it. Glad I found this little gem. Lastly, as the title states, this humidifier does not have a bacteria and odor causing filter as some other humidifiers do. Those are disgusting.