CosmartAir 900ml Air Cooler
(7 reviews)
A 4-in-1 touchscreen air cooler: fan, humidifying and 7-colour LED, with automatic 90° oscillation.
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Key features
- Water tank: 900ml, 6 to 8h of runtime in humid mode
- Oscillation: Automatic 90° plus manual 60° tilt
- Power consumption: 10W maximum via USB port
- Touchscreen, 7-colour LED, automatic switch to plain airflow
In detail: CosmartAir 4-in-1 Portable Mobile Air Conditioner
The CosmartAir belongs to the family of 4-in-1 air coolers: a compact unit that combines a fan, humidifier, LED night light and evaporative water cooling. Its 900ml tank, one of the largest in this compact format, powers a humid mode claimed at 6 to 8 hours of continuous runtime before switching automatically to plain airflow once the water runs out.
Control runs through a touchscreen that centralises the 3 fan speeds (low, medium, high) and the 2 misting modes. Automatic 90° horizontal oscillation sweeps a good part of the nearby space, and is paired with a manual 60° tilt to aim the airflow precisely at a desk or bed. A 7-colour LED night light adds a bit of evening ambience, switchable independently from the cooling function.
Powered via USB rather than a standard mains plug, the CosmartAir connects to a computer, a power bank, a car charger or a mains adapter, for a claimed consumption of 10W maximum. A timer adjustable from 1 to 8 hours allows the automatic shut-off to be scheduled, useful for a full night's sleep with no need to intervene. The manufacturer states operation around 35 dB(A), a quiet level on the lower speeds.
The manufacturer itself notes, in its own product listing, that this unit works without a compressor or refrigerant gas and therefore does not deliver the same level of cooling as professional air conditioning: it is a stopgap air cooler for individual use (desk, bedside, sofa), not a solution for cooling an entire room. Within that scope, its generous tank, touchscreen and dual-axis aim make it a well-equipped option in this price bracket.
Technical data
Detailed characteristics
Performance
| Type?General technical category the unit belongs to (portable, split, evaporative...). | 4-in-1 evaporative air cooler, no compressor or refrigerant gas |
|---|---|
| Power consumption?Electrical power drawn by the unit while running, expressed in watts (W). | 10W maximum, USB powered |
| Noise level?Noise emitted by the unit, in decibels (dB(A)). As a reference, a normal conversation is around 60 dB(A). | About 35 dB(A) as stated by the manufacturer |
Features and connectivity
| Water tank?Capacity of the internal tank collecting condensed water, to be emptied regularly depending on the model. | 900ml, 6 to 8h of runtime in humid mode |
|---|---|
| Fan speeds?Number of fan speeds offered by the unit. | 3 speeds (low/medium/high), touchscreen control |
| Timer?Programmable delay for the unit to switch on or off automatically. | Adjustable from 1 to 8h |
Dimensions and power supply
| Weight?The unit's weight, an important factor for a portable air conditioner regularly moved between rooms. | 1.1kg |
|---|---|
| Power supply?Electrical voltage and frequency required to run the unit. | USB 5V (mains, power bank, computer, car charger) |
Additional information
| Misting modes | 2 misting modes, automatic switch to plain airflow once the tank is empty |
|---|---|
| Horizontal oscillation | Automatic at 90° |
| Vertical tilt | Manual adjustment across 60° |
| Lighting | 7-colour ambient LED |
Frequently asked questions: CosmartAir 4-in-1 Portable Mobile Air Conditioner
No, and the manufacturer says so itself: with no compressor or refrigerant gas, it cools the air through water evaporation for individual use close to the unit, not a whole room like a genuine air conditioner.
The 900ml tank offers 6 to 8 hours of runtime in humid mode depending on the speed selected. Once the water runs out, the unit automatically switches to plain airflow.
Yes, automatic horizontal oscillation covers 90°, paired with a manual 60° vertical tilt adjustment to aim the airflow precisely.
Via a 5V USB port, compatible with a mains adapter, a power bank, a computer or a car charger, for a claimed consumption of 10W maximum.
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Page published on 2 August 2026