Uses significantly less electricity than an Air Conditioner in a room up to 850 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 (1540 CFM air flow) Used with open windows and doors, no permanent installation required Honeycomb cooling media on 3 sides and continuous water supply connection Use in open environments with adequate cross ventilation: For those living in more humid climates, consider portable air conditioning units or window air conditioners. Evaporative coolers perform best when the air is hot with low humidity, such as desert areas like the southwestern United States.