Evap Air Coolers: Portable and Installed Formats

It refers to evaporative cooling: air passes over water-wetted media and some water evaporates, taking heat from the airflow.

Yes, evaporative operation needs water for the wetted pad or filter. Some models can also run as a fan without water; check the manual.

Their cooling effect falls as humidity rises, since less water can evaporate into the air. They also add moisture to the space.

Provide an exit route for air, often a window or vent, and follow the model’s placement and ventilation guidance.