I just bought mine from rural king for $59 . Im not experienceing any rattles or anything on high speed. At 1/6 hp its  enough air for early spring/summer but during the dog days of summer when nights are still over 80 its not going to cool your house down you will still need the ac on those nights. But on cooler nights you can put this fan on intake and bring in the fresh night air which is one thing I like. You can just open a couple of windows a few inches and feel the air being pulled in. The fan cannot cool the air any more than the actual temp is but it might feel cooler. The reason I bought mine is to not use the ac any more than I have too maybe save a buck or two. Its sort of nice to be able to close the window behind the fan which Ive never been able to do that before. But we will see how this fan holds up.