"This is a swamp cooler, not an air conditioner; it is only effective in very dry climates."
The 'Windowless Portable Air Conditioner' claim means it is an evaporative cooler. Unlike a true AC, it doesn't use a refrigeration cycle or exhaust hose, so it cannot significantly lower a room's ambient temperature and adds humidity.
This is for someone in an arid, low-humidity climate who understands evaporative cooling and wants a low-energy alternative to a fan. It provides a localized cool, humid breeze for a small space like a desk area or bedside.
Anyone in a moderate to high humidity climate should avoid this; it will make the room feel clammier. Those expecting it to lower the temperature of an entire room like a real air conditioner will be profoundly disappointed.