I use this product day and night, summer and winter, by placing it near the heat/cool vent in an upstairs bedroom which never quite cools by the air conditioner alone. It is quiet! I run it on high for an hour before I go to bed, and it pushes the warm air out of the room, then use the low setting to pull the cool air from the vent to sleep comfortably. I have owned a Vornado for about 15 years and liked it so well, that I bought this smaller model. This model is powerful and efficiently does the job. I'm thinking of buying a third for a different room. I Love this Product!! Powerful, long lasting, and quiet !