Honeywell Evaporative Air Coolers don’t rely on heavy compressors or refrigerant gas to lower air temperatures, nor do they spray mist. Instead, portable air coolers moderately reduce heat through evaporating water vapor into the air. Honeywell Air Coolers work most effectively in hot, dry climates. Much like a breeze flowing across a lake or the refreshing cool air you feel near a waterfall, Honeywell Evaporative Air Coolers release a comfortable, cool breeze with the natural process of water evaporation. When warm air is drawn into the air cooler, the air is filtered through a wet honeycomb cooling medium, which absorbs heat and naturally cools and humidifies the air.