Many smart homeowners face situations where the room is stifling not because of heat but because of humidity, and it is at these moments that the dehumidification mode available in Xiaomi’s climate devices comes to the rescue, allowing the microclimate to normalize without extreme temperature reduction, making the air more comfortable to breathe.
In modern split and mobile air conditioners such as the Xiaomi Mi Smart Air Conditioner or Mijia ecosystem devices, this mode is often marked with a water drop symbol on the remote or in the app. Understanding how it works will help you save energy and maintain health by preventing mold and fungus from appearing on the walls.
In this article, we will take a closer look at the physical basis of Dry mode, compare it to conventional cooling, and give practical tips for setting up through the Mi Home app, explaining why sometimes drainage is more effective than a powerful blower and how to properly operate the equipment during the rainy season.
The principle of Dry mode in climate engineering
The dehumidification function is based on the fundamental laws of physics related to moisture condensation. When warm air passes through the cold heat exchanger of the inner unit, the water vapor contained in it is cooled and converted into liquid, the condensate drains into a special pallet and drains through the drainage system, and dry and clean air returns to the room.
Unlike standard cooling mode, where the main goal is to quickly reduce the temperature to predetermined values, Dry mode focuses on removing excess moisture. The fan in this case operates at low revs, so that the air is in contact with the cold radiator longer, which increases the efficiency of moisture removal. The compressor is turned on cyclically, maintaining the temperature of the heat exchanger just above the dew point.
⚠️ Attention: In dehumidification mode, the air conditioner may not reduce the temperature of the room significantly if it is already close to the desired temperature.
Xiaomi's technology allows for intelligent management of this process. Humidity sensors, built into advanced models or connected separately, transmit data to the processor. The system itself determines when to start the drainage cycle to maintain optimal hygrothermal comfort.
Physics of the process
Key differences between Dry mode and Cool and Auto
Users often confuse modes by expecting a high-power cold wind from the drying function. However, Xiaomi’s algorithms clearly distinguish these scenarios: Cool mode runs at full compressor and fan power until the target temperature is reached, then goes into maintenance mode.
Dry mode works differently. The fan speed is usually fixed at a minimum and is not regulated by the user. The compressor operates in short cycles: it turns on to cool the radiator and collect moisture, then turns off while the fan continues to drive air, which ensures a gentle and imperceptible removal of moisture without drafts.
Auto mode tries to make its own strategy based on the difference between the current and target temperature, but it doesn't always respond correctly to high humidity at normal temperature, and manually turning on the dehumidification function will be a more effective solution for creating a comfortable environment.
The table below compares the main characteristics of different modes of operation of the air conditioner:
| Parameter | Cool mode (Cooling) | Dry mode (Dripping) | Fan mode (Ventiling) |
|---|---|---|---|
| Main objective | Temperature drop | Moisture removal | Air circulation |
| Fan speed | Adjustable (high) | Fixed (low) | Regulated |
| Compressor operation | Constant or temperature | Cyclical (pulse) | Off. |
| Effect on humidity | Average. | Maximum. | Absent. |
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The main difference between Dry and Cool is the priority of moisture removal over the rate of temperature reduction, which is achieved by working the fan at minimum speeds.
How to enable and configure the function through the Mi Home app
Xiaomi’s climate control is much more convenient to do via smartphone, using the Mi Home or Xiaomi Home platform.This gives you access to advanced settings that are often not available on a standard remote control. First, make sure your air conditioner is connected to the Wi-Fi network and displayed in the list of devices.
Once you log in to the device interface, find the mode switch button, which may look like a snowflake icon that you need to switch to the drop icon (Dry), which in some versions of the interface may be called "Dehumidify" or hidden in an additional climate settings menu.
The app allows you to set the desired temperature, although in the dehumidification mode this parameter plays a secondary role. More important is the setting of the timer and speed of rotation of the blades (if the model allows them to adjust in this mode), and here you can activate the smart scenario function by connecting the air conditioner to the humidity sensor.
☑️ Set up a smart drainage scenario
Using Xiao AI, Google Assistant or Amazon Alexa, you can also activate voice drain mode. Just say, "Put the living room drain on," and the system will execute the command, which is especially useful if the remote is lost or far away.
Energy efficiency and impact on electricity bills
One of the most common questions is about power consumption, because in Dry mode the compressor is cyclical, not constant, and the fan is spinning at a minimum speed, the overall power consumption is reduced, which makes the dehumidification function more economical than the Cool's full cooling mode.
However, it is worth considering that the time to achieve the desired effect can be increased. If the cooling mode of the room cools down in 20 minutes, then the quality dehumidification of a large volume of air can take an hour or more.
Inverter compressors in Xiaomi’s top-end models further optimize this process, smoothly adjusting power, avoiding peak start-up loads, which is typical of conventional air conditioners, extending the life of the device and making the work almost silent.
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For maximum energy savings, use Dry mode at night or in cloudy weather when the temperature outside is not too high, but the humidity is elevated.
If the room is constantly getting moist air from the street through open windows or doors, the air conditioner will work in vain, expending energy without visible result.
The effect of humidity on health and comfort of living
Maintaining optimal humidity levels (40-60%) is critical to human health, and too dry air overrides the mucous membranes of the nose and throat, reducing local immunity and increasing susceptibility to viruses, but excess humidity also carries serious risks.
High humidity creates ideal conditions for the reproduction of dust mites, molds and bacteria. For people with allergies or asthma, using a dehumidification mode in Xiaomi air conditioners can become a necessity.
In addition, in dry air, heat is more easily tolerated. In humidity above 70%, sweating worsens and the body cools worse, even if the temperature in the room is not extreme. By drying the air, you subjectively feel more comfortable at higher temperatures, which will allow you to lessen the powerful cooling mode.
Regular use of the Dry feature also protects furniture, books, electronics and clothing from damage caused by dampness. Wood products do not swell, and the metal does not corrode.
Frequent operating errors and technical limitations
Despite the ease of use, users often make mistakes that reduce the efficiency of the device, one of the most common is trying to dry the air in a room with open windows, which is equivalent to trying to draw water from a leaky bucket: new moisture will constantly come from the outside.
Another mistake is to use Dry mode at an already low air temperature (below +18..+20 ° C). In such conditions, the heat exchanger can become coated with frost, which will lead to reduced efficiency and possible failure of the compressor. Modern Xiaomi models have frost protection, but do not take the risk.
⚠️ Warning: Do not use drying mode to dry laundry indoors. Condensate produced by drying large volumes of wet fabric can overflow the drainage system faster than it can remove it.
Also, consider that air conditioners are not specialized dehumidifiers. If there are serious problems with dampness in the room (for example, leaks, groundwater, lack of ventilation), the power of the household air conditioner may not be enough, in such cases, a professional industrial dehumidifier is required.
Regular maintenance of the filter and drainage system is the key to long work. Dirty filter worsens air throughput, and clogged drainage will lead to condensation leaking into the room. 2-3 weekly active operation.
What to do if water is dripping from the air conditioner?
Comparison of Xiaomi models with the drainage function
Xiaomi’s range of climate technology is extensive, and not all models support full-fledged Dry mode with intelligent control. Budget versions may have a simplified implementation, where dehumidification occurs simply as a side effect of working at minimum power.
Flagship models like the Xiaomi Mi Smart Air Conditioner Pro are equipped with more accurate sensors and advanced algorithms, they can switch between modes depending on the hygrometer readings, and support for the Zigbee or Bluetooth Mesh protocol for stable communication with external sensors is also important.
When choosing a device, pay attention to the performance of moisture removal, which is often indicated in the technical documentation in liters per hour (l / h). For a standard living room with an area of 20 sq.m. the optimal indicator will be the removal of 1-2 liters of moisture per hour.
Integration with the smart home ecosystem allows you to create complex scenarios, for example, when you turn on the “Nobody at home” mode, the air conditioner can go into light drainage mode to prevent the musty smell from appearing when you arrive.