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Evaporative Air Cooler Humidity: How Water Cooling Changes the Air

Evaporative cooling can lower the temperature of moving air while adding moisture. Whether that trade-off feels comfortable depends on outdoor humidity, ventilation and the room.

An evaporative air cooler uses water to cool a stream of air, so humidity is part of how the device works. The U.S. Department of Energy notes these coolers work best in arid climates; in moist conditions, evaporation and the cooling effect are constrained. That makes local climate and an exit path for damp air key buying considerations.

Evaporative Air Cooler Humidity: How Water Cooling Changes the Air

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Do Evaporative Coolers Work in High Humidity?

Common questions

Questions before you buy

Does an evaporative air cooler increase humidity?

Yes. Direct evaporative cooling adds water vapor as it cools air; the EPA describes these units as increasing indoor relative humidity.

Are evaporative coolers effective in humid climates?

Their cooling effect is limited when the air is already humid. DOE guidance says evaporative coolers work best in arid climates.

Should windows be open when using an evaporative cooler?

A route for air to leave helps prevent moisture from accumulating. Follow the appliance manual and ventilate the room.

Can an evaporative cooler cause damp or mold?

Excess moisture can contribute to indoor moisture problems. Monitor room conditions, keep the unit clean, and stop using it if condensation or dampness appears.

Is an evaporative cooler a dehumidifier?

No. It adds moisture during direct evaporative cooling; it does not remove water from indoor air.