Bests & Worsts Reviews from Amazon

I live in Orange County, California, near the beach, so the air is generally cool outside. The sun warms the inside of the house, so the trick is getting the cool air into the warm house. This fan is great for that. NOISE: There are three speeds. Low and medium are fairly quiet. High is louder. AIRFLOW DIRECTION: There are three options- BOTH IN, BOTH OUT or EXCHANGE (one fan in, one fan out). The only mode that really cools the room is BOTH IN, but it works well (it works even better if you open the bedroom door so there is no resistance to airflow). SETUP: installation was easy, but note that I have a narrow window that slides up and down. Apparently, it fits "double-hung, vertical slider, and casement windows 24 to 37 inches wide." For windows that slide sideways, the manual indicates to set the fan vertically in the window opening, with the left side down (ostensibly because the fins on the left are fixed/hard, while the fins on the right are retractable/accordion type). I recommend this product. The only caveat is that I have only had it for a few days, so I have no idea if it will be durable. The five year warranty gives some comfort. SEPTEMBER 24, 2012 UPDATE: it's been eight years (i.e., three years past the warranty expiration) and it still works fine. So, thumbs up for durability as well. One caveat- it does pull a lot of dust, etc., in from the outside. I wedged a 14x24x1 air filter in front of it, which does affect airflow, but does wonders in reducing the amount of dust, etc., pulled-in. I would recommend the fiberglass strand type filters over the pleated fabric type filters.