Almost silent at the lower demand. Maytag, Fridgidaire,Tappan,Westinghouse are all brands manufactured by Nordyne. 23 SEER and very quiet operation. In the mid 50 DB ratings at nominal capacity. Quieter at lower steps. Like Beenthere said, they are not for everyone. Cost could be a factor in your decision . It is a total comfort system that has no rivals at this time in my opinion.