I have one of these and three 50250′s. the noise factor is pretty much the same. Higher air movement setting the higher the noise level. Purifies air well. Honeywells are best bang for the buck. This model tends to vibrate like its slightly off balance. This is common, but you can see it and hear the uneven sound. None of the larger units do this. Would give more stars if it did not. Still performs its task without any other issues. Most including myself find these too noisy for bedroom. I have a Winix for that.