3-in-1 Appliance With three possible cooling processes (air/water/ice), this portable evaporative cooler not only can be as a fan, also reduce air temperature as well as add humidity. Manual and Continuous FillFeaturing an large 8-gallon water tank, this evaporative air cooler will keep going for hours, you can add water from the top manually or attach a garden hose for uninterrupted cooling without needing to be refilled.