The EV250 Portable Evaporative Cooler draws in warm, stale air and transforms it into a cool breeze of fresh, clean air using a combination of a built-in ionizer and internal water chamber. You can even speed up the process with the help of the provided ice pack that can be filled, frozen and then placed in the water chamber. Three fan speeds, three wind modes, adjustable louvers and an internal swing mode allow you to customize the circulation of the cool, fresh air created by this energy-efficient machine. Sitting on castors, it is simple to relocate the EV250 anywhere in the house. Operation is easy using either the controls on top of the unit or the full-featured remote control. Optimized for use in hot, dry climates with relative humidity lower than 50-60% (such as the southwest United States), but the Portable Evaporative Cooler will also provide a cooling breeze in higher-humidity climates.