An air cooler uses little water: the water in the tank evaporates slowly, and the tank usually needs refilling after a few hours to a day of use. How quickly this happens depends on the settings, the size of the tank, the temperature, and the humidity in your room. Therefore, there is no fixed liter value that applies to every device.
Quick answer: an air cooler consumes water because it evaporates into the airflow. The amount that disappears is mainly determined by the fan speed and the dryness of the air. Check the tank with every use and refill it when it is almost empty.
Why does an air cooler use water?
An air cooler works through evaporation. The fan pulls warm air past a wet filter or wet panel, the water evaporates, and in doing so, extracts heat from the air. The air that comes out therefore feels fresher. That water has to come from somewhere, and what evaporates is gone. You can read more about what an air cooler is and how it works.
What determines the water consumption of your air cooler?
The water consumption of an air cooler is mainly determined by four things. A higher fan speed provides more airflow past the wet surface and therefore more evaporation. Water evaporates faster in dry, warm air than in humid air. A larger tank simply lasts longer, and ice or cold water in the tank mainly changes how fresh the air feels, not necessarily how much evaporates.
Also, pay attention to the humidity. If it is already very humid outside and inside, less water will evaporate and the air cooler will not cool as well. In that case, a fan is often a better choice. That difference is explained in air cooler versus mobile air conditioner.
How often should you refill an air cooler?
As a rule of thumb, refill the tank before using it for a long period, for example before going to sleep or starting a workday. With a compact, portable air cooler, the tank is small, so expect to refill it several times on a hot day. Do not wait until the tank is completely empty: without water, the device will no longer cool and will only blow air.
| Situation | Effect on water consumption | Tip |
|---|---|---|
| Highest fan speed | Higher | Use the lowest speed that feels comfortable |
| Dry, warm air | Higher, but better cooling | Refill more often |
| Humid air | Lower, less cooling | Consider a fan |
| Cold water or ice in the tank | Fresher air | Use cold water, refill when the ice has melted |
How to keep the water in your air cooler clean
Standing water can start to smell over time and is a suitable environment for bacteria. Therefore, empty the tank if you are not using the air cooler for a few days, rinse it out, and let everything dry well. Preferably fill it with fresh tap water and always follow the cleaning instructions in your device's manual. If you want extra freshness, you can read in does an air cooler work with ice cubes? how to best use ice.
The Dynter SM211: compact air cooler with water tank
The Dynter SM211 is a wireless mini air cooler that you fill with water and/or ice. This makes it easy to take from the bedroom to your workspace.
Product: AirFlow Air Cooler SM211 (black or grey)
Cooling: hydro-cool technology with water and/or ice in the water tank
Speeds: three adjustable speeds
Battery: 2000 mAh, rechargeable via USB-C, up to 3-4 hours of cooling after a full charge
Sound and light: ultra-quiet according to the product page and with a soft LED night light
Dimensions and weight: 16.5 x 16.5 x 17 cm, 880 grams
Keep in mind that a compact model has a small tank: ideal for personal cooling, but not intended to cool an entire living room.
Wondering if the SM211 is right for you? View the Air Cooler SM211 Black or the Air Cooler SM211 Grey, or view all air conditioners and fans from Dynter. Want to know how long the battery lasts? Read how long the battery of a portable air cooler lasts.
Frequently asked questions
How many liters of water does an air cooler hold?
That differs per model. Compact portable air coolers have a small tank, larger models have a substantial reservoir. Always check the device specifications for the capacity.
Can I run an air cooler without water?
Then it works as an ordinary fan and it barely cools. Therefore, always refill water as soon as the tank is almost empty.
Is ice in the air cooler necessary?
No, ice is optional. The SM211 can be filled with water and/or ice; ice or cold water provides a fresher airflow.
Can I leave an air cooler on at night?
You can, as long as the tank contains enough water and you follow the manual. A low setting is most pleasant for the bedroom.
Do I have to change the water often?
Yes, change the water regularly and empty the tank if you are not using the device for a long period so that the water does not start to smell.