No, the humidity is at optimum levels in the summer months throughout most of the western USA, including the deserts. Traditional air conditioners dry the air out too much in this region, causing many people to run humidifiers to make it more comfortable. Direct evaporative air coolers add too much humidity. When the air becomes too humid, the skin cannot evaporate moisture off easily and use the body’s natural cooling system. This humidity, and the musty smell that sometimes comes from such a cooler, is why many people refer to a direct evaporative cooler as a “swamp cooler”. There is direct evaporative cooling advertising stating humid air feels colder. That is true for temperatures 50°F and colder; however, in the summer months, room air is generally held at about 70°F or above, where high humidity feels like a swamp. Skin becomes clammy and can’t evaporate water easily.