Honeywell CO25MM 52 Pt. Indoor/Outdoor Commercial Evaporative Air Cooler, Grey Uses significantly less electricity than an Air Conditioner in a room up to 462 sq. ft. - Can also be used outdoors! BEST for hot dry climates, where the air humidity is low Non-compressor system cools naturally, efficiently and inexpensively (1270 CFM air flow) Used with open windows and doors, no permanent installation required 6.6-gallon water tank, plus continuous water supply connection with built-in overflow protection