Air Cooler Evaporators: Portable, Ducted and Commercial Types

It moves air across a wet pad or filter. As water evaporates, it absorbs heat from the air; the process also adds moisture to the air.

It is less effective when humidity is high because less water can evaporate into already moist air. Australian government guidance says evaporative coolers work well in low-humidity inland regions.

Usually, yes. Evaporative systems need a route for indoor air to leave as fresh cooled air enters; follow the instructions for the exact model and room.

No. Evaporative coolers use water evaporation and ventilation; refrigerated air conditioners actively remove heat and typically operate with the room closed and an exhaust arrangement if portable.