In most cases, you can simply use clean tap water in an air cooler. Distilled or demineralized water is a good choice if you live in an area with hard water, as it reduces limescale buildup. Regardless of which water you use, you will always need to refresh and clean it.
Direct answer: use clean, cold tap water or, in the case of hard water, distilled or demineralized water. Do not add cleaning agents, fragrances, or other substances. Always check your air cooler's manual.
Why does the type of water matter?
An air cooler cools by allowing water to evaporate. Tap water contains minerals, including calcium. When it evaporates, these minerals are left behind in the tank and on the components. In hard water areas, this can lead to white deposits that may reduce performance over time. Distilled or demineralized water contains far fewer minerals, resulting in less buildup. You do not necessarily have to choose it, but it can make maintenance easier.
Tap water, distilled water, or rainwater?
| Type of water | Advantage | Consideration |
|---|---|---|
| Tap water | Always available, no extra cost | Can leave limescale in hard water |
| Distilled or demineralized water | Less limescale buildup | Costs money and must be purchased |
| Rainwater | Not particularly recommended | Can contain dirt and bacteria |
What do you do with ice cubes and cold water?
Cold water or ice in the tank makes the air blown out by the air cooler fresher, because the evaporation process then draws less heat from the surroundings. To find out how significant that effect is, read does an air cooler work better with ice cubes. Do use clean water, even for the ice cubes.
Keep the water fresh
Do not leave water in the tank for days. Stagnant water can start to smell and provides a breeding ground for algae and bacteria. It is best to refresh and clean it regularly, especially if you use the air cooler every day. To find out how this works, read how to clean an air cooler and keep the water fresh. Want to know how often you need to refill it? That is explained in how much water an air cooler uses.
Dynter SM211 air cooler
Dynter AirFlow SM211 mini air conditioner: a compact, cordless air cooler with three adjustable speeds. Fill the water reservoir with water and/or ice for a fresh breeze.
Battery: 2000 mAh, rechargeable via USB-C. According to the product page, the battery provides approximately 3 to 4 hours of cooling after a full charge.
Usage: according to the product page, whisper-quiet and equipped with a soft LED night light. Hydro-cool technology converts warm air into a fresh breeze.
Size: 16.5 x 16.5 x 17 cm and 880 grams, easy to take with you. Available in black and white.
The product page does not state a preference for the type of water. Follow the included manual.
Choose your air cooler
Are you looking for a compact air cooler for home, the office, or on the go? Then check out the Dynter SM211 in black or the SM211 in gray. You can find more cooling solutions in the air conditioners and fans collection. Is it very humid outside? Then read how an air cooler works in high humidity.
Frequently asked questions
Can I put tap water in an air cooler?
In most cases, yes. Use clean, cold water and refresh it regularly. In the case of hard water, you can choose demineralized or distilled water to limit limescale buildup.
Do I have to use distilled water?
That is not mandatory unless the manual specifies it. It can help prevent limescale buildup.
Can I add anything to the water?
Do not use cleaning agents, fragrances, or other substances unless the manual expressly allows this. This can damage the device and you will inhale the fumes.
How often do I need to refresh the water?
When you do not use the air cooler for an extended period, empty the tank. For daily use, refresh the water regularly to prevent odors.
Does an air cooler work better with cold water?
Cold water or ice creates a fresher airflow. The cooling remains limited and depends on the humidity and the surroundings.