The Windmill AC I purchased is meeting and exceeding expectations. There is a bedroom in my house’s attic / third floor that gets warm. A competitor product I purchased proved loud and unreliable. Instead, I went with Windmill, which was fairly easy to install and works well in terms of operations, noise, and appearance. I also considered a similar in window product by a competitor but that one had a more complicated installation and didn’t look as nice. I would recommend this product.