How to choose an air dehumidifier

To combat condensation created by heating or humidity in homes, the air dehumidifier reduces the humidity rate and can be condensing or absorbing. Compact, economical and design, it is chosen according to its airflow, the volume to be treated, its range and extraction capacity.

Choosing the best air dehumidifier

If your main accommodation has a humidity problem, it is necessary to regulate its humidity level and with an air dehumidifier that you will choose according to its characteristics:

  • the volume of the room in m3 or the span in m² treated;
  • the higher the airflow, the more efficient the dehumidifier;
  • the humidity extraction capacity corresponds to the number of liters extracted per 24 hours and depends on the humidity rate.

For more comfort, you prefer:

  • an adjustable hygrostat to automatically regulate the humidity rate;
  • low noise level to reduce nuisance.

If you are looking for a dehumidifier for a country house or holiday apartment that will work without supervision, in addition to the characteristics linked to the humidity rate and the volume to be treated, you will preferably choose:

  • a hot gas defrosting dehumidifier because over a temperature range between 5 and 15 ° C, they offer a performance of about 30% higher;
  • a water drainage system that allows you to connect a hose to drain water directly into a sink or to connect it directly to a drain hose.

Humidity absorber

If you are looking for an economical and practical solution to reduce the humidity level in a small room, you can opt for a humidity absorber. Inexpensive and efficient, you will empty its container periodically and change its refill bag. Given for 12 m².

Dehumidify a room to ensure the durability of materials

Humidity is necessary for our daily comfort but it must be moderate. In fact, too high a humidity level can favor the appearance of mold on ceilings, walls, furniture, and can even go so far as to cause the wallpaper to peel off. High humidity can also cause health problems (asthma, cough, rheumatism, etc.).

Some rooms, such as the kitchen or the bathroom, are more exposed to significant point humidity (cooking vapors, tumble dryers, etc.). The dehumidifier is the ideal solution to overcome this constraint! Simple, efficient and economical, it dehumidifies the ambient air to make it healthy!

The air dehumidifier can also be used to accelerate the drying of a room under construction (painting, plasters, etc.), after water damage, to clean up crawl spaces, but also and quite simply to save energy (heating humid air requires more energy than heating drier air).

The different types of dehumidifiers

There are two main models of dehumidifiers: condensing air dehumidifiers and absorption air dehumidifiers.

Condensing air dehumidifier or compressor dehumidifier

Efficient, compact and mobile (fitted with casters), it is the most common dehumidifier for domestic use. A fan draws in the humid air and returns it to a condenser (coil cooled by a refrigerant gas compressed by a compressor).

The air is cooled and the water condenses in a tank, the dry air is then heated and returned to the room. Condensation dehumidifiers are more effective in a hot environment and they treat highly humid rooms effectively. They are more expensive and noisy.

Absorption air dehumidifier or air dryer

This dehumidifier uses a blower that returns air to silica gel (silica gel) whose moisture absorption properties are recognized. It is silent, economical and ecological.

However, for normal use, 20 ° C and 70% humidity, silica gel dehumidifiers do a better job than condensing dehumidifiers, which are generally tested by manufacturers, in extreme humidity conditions of 30 ° C and 80% humidity.

The advantages of a humidity absorber

A humidity absorber is a derivative of an absorption air dehumidifier that does not require any installation (no electrical connection).
It is a plastic container (several formats to choose from) containing silica gel in a sachet which absorbs moisture and transforms it into water collected in the tank.

Practical and economical, the life of a moisture absorber remains however quite limited (about 2 months of autonomy) and it is necessary to empty the tank regularly.

In addition, moisture absorber is only suitable for small areas with low humidity (humidity) to be treated.

The characteristics of choosing a dehumidifier

Before choosing the criteria for your dehumidifier, you must first determine what your needs are. To do this, you need to assess:

  • the volume of air and the surface of the part to be treated;
  • the humidity level observed;
  • the temperature of the room to be heated, the cooler the room, the greater the efficiency of the dehumidifier;
  • the source of humidity of the room to be treated, as a reminder, the capacity of a dehumidifier must be greater than the amount of water produced by the room. Example: a room with a swimming pool must have an evaporation rate lower than the air capacity of the dehumidifier.

Once your needs have been assessed, you need to estimate the airflow, extraction capacity, range, humidistat and noise level. Other secondary criteria such as design, handling and various functionalities will then be determined.


The airflow is the essential criterion to take into account! It is the quantity of humid air (in m3) that the dehumidifier is able to treat over a determined period (per hour or per minute). The higher it is, the more effective it is. The airflow has the function of evaluating the capacity of air renewal by the device.

Extraction capacity

The extraction capacity represents the number of liters of water that your dehumidifier is able to extract over a fixed period (1 hour or 1 day). Count an extraction capacity of 5 to 30 liters/day for domestic use and/or for a humid room of medium volume.

Scope and volume processed

The range is the area in m² that your dehumidifier will cover. The larger the interior surface of your room, the greater the range. The treatment can also be expressed in m3 which corresponds to the volume of the room.

Hygrostat: regulation of the hygrometry rate

The hygrostat or humidity regulator is manual or automatic, it is the command which will allow you to set the desired humidity level (set humidity level) as a reminder, the ideal humidity level for inside the home is between 45 and 60%.

The electronic hygrostats allow automatic regulation of the humidity level which results in the automatic start of the dehumidifier.

Sound level

The sound level is a real choice criterion, a good dehumidifier is a silent dehumidifier! And in this game, the silica gel dehumidifier wins the duel. Less noisy, it also emits a softer sound to the ear than the compressor dehumidifier, whose airflow determines the sound level (the higher it is, the noisier the device). Choose the right compromise between efficiency and decibels!

Hot gas defrost

Compared to dehumidifiers of the same power equipped with an electronic automatic defrosting system, dehumidifiers with hot gas defrost offer a performance of about 30% superior over a temperature range between 5 and 15 ° C. Note that above 15 ° C, the dehumidification performance is identical regardless of the defrosting system. They are recommended in unheated rooms.

Design and maneuverability

Design is not an essential criterion, however, if you can have a discreet or aesthetic device, it is better … Note that except for dehumidifiers for professional use, domestic models tend to be similar.

The maneuverability, even if your dehumidifier is not intended to be moved often, is always appreciated! Dehumidifiers on casters are preferred for simplified movement from one room to another.

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