How to choose a dehumidifier

Increased air humidity in the room threatens the development of fungus, mold, and unpleasant odors. All this leads to poor health of household members. Also, high humidity can cause damage to repairs in the house. If it is not possible to eliminate the cause of high humidity, a dehumidifier comes to the rescue. Public news service I figured out how to choose a dehumidifier.

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The danger of over-humidified air

A dehumidifier is a climate control device that removes excess moisture and creates a pleasant microclimate. In winter, the optimal humidity level should be 30–45%, in summer – 30–60%. If these indicators are exceeded, then the room begins to smell damp, clothing, furniture, and textiles become saturated with this mustiness, wallpaper begins to peel off, and the soil of indoor plants does not dry out. The ventilation system does not always fully remove moisture.

Paint coming off due to dampness

This phenomenon is often observed in apartments on the ground floor due to its proximity to the basement. Also, high air humidity occurs due to faulty plumbing or errors at the design stage of houses. You can estimate the humidity level using a hygrometer, but if you don’t have one, you can try to determine this indicator yourself:

  1. Place a glass of cold water in the refrigerator for 3 hours.
  2. Bring it into your room and place it away from heaters.
  3. Look at the surface of the glass after 5-10 minutes: if condensation has not settled on the walls, then the room is very dry; if drops are noticeable, then the humidity level is normal; and if there is too much condensation, then there is high humidity in the room.

If in your case the third option, then a dehumidifier will solve the problem. Let’s look at what types modern dehumidifiers are classified into.

By area of ​​application

Depending on the specifics of the room, dehumidifiers can be divided into the following types:

  • Household.

Such devices are intended for use in a home, apartment or office. These are compact models that operate almost silently and absorb from 10 to 50 l/day. Such devices can be moved to any convenient place. There are also models with additional capabilities that remove dust, aromatize or ionize the air.

  • Industrial.

Such massive units have a capacity of 150 l/day. They are used to dehumidify large areas, such as swimming pools or laundry rooms.

According to the mechanism of operation

Next, let’s look at what types of air dehumidifiers are based on their operating principle:

  • Condensation.

This is the most popular model that works like an air conditioner. Humid air enters the housing, where it passes through cold and hot heat exchangers and exits into a room devoid of moisture.

  • Adsorption.

Such devices have adsorbing agents that absorb moisture from the air, but this mechanism is used in industrial dehumidifiers operating in harsh conditions at temperatures from –20 to +40 degrees.

  • Assimilation.

In this case, moist air is removed from the room and replaced with outside dry air. Such devices are used in industry in areas with a dry climate.


When purchasing a dehumidifier for your home, only household models should be considered, so let’s figure out how to calculate the performance of a device suitable for a specific room. Productivity is the volume of water that the device removes per day in liters. This indicator is determined by the area of ​​the room: the larger it is, the higher the productivity should be.

For a standard apartment, the optimal performance of a dehumidifier is 20 l/day. But if you want to get more specific numbers, then multiply the area of ​​the room by 0.7. That is, for example, for a room of 20 m2 you will need a dehumidifier with a capacity of 14 l/day.

Noise level

The quieter the dehumidifier is, the more pleasant it is to use in the apartment. The best option for home use is a device with a noise level of 45 dB.

Water drainage method

Air dehumidifiers are classified according to the method of water removal:

  • container. Such models have a special water tank that needs to be drained several times a day;
  • adsorption disk. In this case, the device has a built-in absorbent disk with filler, which needs to be updated regularly;
  • hose. Appliances with a hose do not need to be replaced or drained. It is enough to lower the hose into the sink, but this can create inconvenience in the house.


Some models have a built-in hygrostat, that is, a sensor that calculates the humidity level in the room and, if necessary, starts the equipment. Before work, you need to indicate the required indicator, for example, 40%, and turn on the device. As a result, when the air is dried to 40%, the hygrostat will turn off the equipment, but will continue to control the level of humidity in the room.

Thus, the presence of a hygrostat is an excellent addition, which makes it possible to leave the device unattended without the risk of drying out the air.

How to care

To prevent the purchased dehumidifier from breaking down prematurely, follow the following care recommendations:

  • Once every 2-3 weeks, clean all grates from dust and dirt;
  • wash all dismountable parts under running water and dry thoroughly before reinstalling;
  • Wipe non-removable elements periodically with a soft cotton cloth treated with soapy water, after unplugging the equipment.

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