The most important difference between an air cooler and a portable air conditioner is that an air cooler cools air via water evaporation, while a portable air conditioner uses a compressor and refrigerant and vents warm air outside through a hose. As a result, a portable air conditioner cools more effectively, while an air cooler is simpler, lighter, and more energy-efficient.
How does an air cooler work?
An air cooler allows air to flow over a damp surface. The water evaporates, extracting heat from the air, which makes the air feel cooler. This works best in a dry environment. If the air is already humid, less water evaporates, and the effect is smaller. You can find more explanation in What is an air cooler and how does it work? and in Does an air cooler work in high humidity?.
How does a portable air conditioner work?
A portable air conditioner works like a refrigerator: a compressor cools a refrigerant, which absorbs heat from the room. That heat is blown outside through a discharge hose, usually through a window. As a result, the temperature in a room can truly drop, even if it is humid. The downside: the purchase cost, the installation of the hose, and the power consumption are higher, and the device is larger and heavier.
The most important differences
| Feature | Air cooler | Portable air conditioner |
|---|---|---|
| Cooling principle | Water evaporation | Compressor and refrigerant |
| Room temperature | Drops slightly, mainly affects perceived temperature | Drops noticeably |
| In high humidity | Less effective | Continues to work |
| Discharge hose to outside | Not needed | Usually required |
| Power consumption | Low | Higher |
| Maintenance | Refilling water and cleaning | Checking condensation and filters |
Which one should you choose for your situation?
Are you looking for a personal cooling breeze at your desk or nightstand, without a hose and with low power consumption? Then an air cooler is a good fit. Does an entire room need to be significantly cooled, for example in an attic during a heatwave? Then a portable air conditioner is the more realistic choice. If you want to limit the heat in other ways first, read How to keep your home cool without air conditioning?.
Quick answer: an air cooler cools via water evaporation and is suitable for dry air and local cooling. A portable air conditioner cools with a compressor and hose and lowers the room temperature more noticeably, but uses more electricity and requires more installation.
Featured: the AirFlow SM211 air cooler
The Dynter SM211 is a compact, portable air cooler. It is not a replacement for a portable air conditioner, but a portable option for local cooling.
Speeds: three adjustable speeds
Cooling: with water and/or ice in the reservoir
Battery: 2000 mAh, charging via USB-C; according to the product page, up to 3 to 4 hours of cooling
Dimensions and weight: 16.5 × 16.5 × 17 cm, 880 grams
Extras: cordless, LED night light
To find out whether ice in the reservoir actually provides more cooling, read Does an air cooler work with ice cubes?. View the AirFlow SM211 in black, the SM211 in grey or the collection of air coolers and fans.
Frequently asked questions
Is an air cooler the same as an air conditioner?
No. An air cooler uses water evaporation, an air conditioner uses a compressor and refrigerant.
Does an air cooler work in a humid room?
Less effectively, because water evaporates more slowly in humid air. The effect is smaller in that case.
Does an air cooler need a discharge hose?
No. A portable air conditioner usually does.
Is an air cooler more energy-efficient?
Generally yes, because it does not contain a compressor. Furthermore, the SM211 operates on a battery and charges via USB-C.
Can an air cooler cool an entire room?
Expect mainly local cooling. For a noticeably lower room temperature, a portable or fixed air conditioner is more suitable.