UltraCool CP70 Portable Evaporative Cooler, 350 Sqft., 700 CFMUltraCool CP70 Portable Evaporative Cooler is an ideal way to cool patio and deck spaces, garages and workshops. This unit cools up to 350 square feet. and features digital controls which allow you to make precise adjustments as needed. For your convenience, a timer feature allows you to set the runtime as desired. Evaporative cooling is one of the oldest, simplest and most natural methods of cooling. This process occurs when hot, dry air passes over