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The indoor relative humidity is affected by multiple factors such as room area, floor height, air circulation capacity, air conditioning and heating size, etc. It is not easy to raise the whole room to a certain level. However, we can still use the humidifier to ensure that the humidity in the frequently active area is maintained in a relatively good state.
When purchasing a humidifier, it is recommended to choose one with large humidification capacity. Because in the national standard, the performance of humidifier is not measured by the increase of indoor relative humidity in a certain period of time, but by the amount of humidification in a certain period of time.
In fact, if you buy a humidifier with a large amount of humidification, you need not worry too much about the problem of humidity exceeding the standard, because when the heating room in the north is extremely dry in winter, it rarely happens that the humidity exceeds the standard. On the one hand, it will be affected by the factors mentioned above. On the other hand, most humidifiers have only one or two hundred humidification capacity, which is not enough to make the humidity exceed the standard.
1. Water
Soft water is recommended for ultrasonic type, and hard water can be used for direct evaporation type.
Because of the principle of vibration atomization humidification, the ultrasonic humidifier is prone to produce "white ash", that is, scale, in areas with hard water quality, so it is recommended to use soft water. The most traditional way to obtain soft water is to boil the tap water, and some calcium and magnesium ions will deposit into scale. If you feel that it is not enough, you can also choose to install a softener, use softened water, or directly use purified water.
The direct evaporative humidifier has much lower requirements for water quality because of the filtration of the evaporation core. Some humidifiers even require the addition of tap water. Because the tap water is often disinfected by the water plant, and the disinfection ingredients contained in it can help to inhibit the bacterial growth in the water tank.

2. Humidification capacity and water tank capacity
Humidification volume and water tank capacity shall be as large as possible. The humidification volume is an indicator required by the national standard, and the merchants are obliged to provide it. The higher the humidification amount is, the humidifier can vaporize and deliver more water to the room at the same time. The humidifier is an electrical appliance that needs to be turned on for a long time. If the water tank capacity is too small, it is inconvenient to add water frequently.
It should be noted that the two indicators should be positively correlated. If the humidification amount is small and the water tank capacity is large, water storage will occur, resulting in safety and health risks.
3. Humidification range
Most ultrasonic humidifiers have the problem of small humidification range more or less because they are not equipped with fans or the fan power is small. The water vapor can not be effectively diffused, which will lead to high local humidity, and may also produce water stains, wet the sheets and furniture.
4. Noise
Under the condition that the humidification amount is fixed, the lower the noise, the better. In other words, in the sleep mode, the greater the humidification, the better. Sterilization filtration and safety protection The water tank of the humidifier stores water for a long time, which is easy to produce bacteria, so effective sterilization measures are needed. The water quality in different areas is different, which may cause scale and damage the humidifier, so filtering measures are required. If you have pets or children at home, you should also prevent them from knocking over and getting electric shock.