I tried a smaller 300 to 400 ml one in a 400 square foot living room and it would fade out by early morning, so stepping up to a larger tank made the difference.
Set the mist to low at night and use an eight hour timer, I just press it before bed and it runs evenly then shuts itself off so I do not wake up to a dry tank. Make sure there is a true auto off on empty and an option to dim or disable the light. No noise trouble.
