5 Liter Air Coolers: What to Compare Before You Buy

It describes the stated water capacity, not the unit's cooling output or the time it will run. Runtime depends on settings and conditions, so check the product manual for the specific model.

No. An evaporative air cooler uses water and airflow to create a cooler-feeling breeze; an air conditioner uses a refrigeration system to remove heat. Compare the type of cooling you need before choosing.

Ventilation is generally important because evaporative cooling adds moisture to the air. Follow the manufacturer's placement guidance and allow air to move through the room.

Tank capacity cannot answer that on its own. Look for airflow information and the maker's room guidance, and consider whether the cooler is intended to provide personal airflow or serve a larger space.