i am writing this review after using cooler for a month i would say it is silent enough it cool down your bed room within 1520 mins so you can put it on before going to room as of now i am running it on level on and most of the time i have to switch pump off in mid night as you start feeling cold very effective cooling and run well on inverter excellent build quality you may feel fishy smell for few days but it will go off once you change water