A dehumidifier (also dehumidifier)[1]​ is a device that reduces ambient humidity by filtering the air in a room and depositing the water resulting from condensation in a tank for this purpose.

There are many types of dehumidifiers, depending on their use and type.

The first dehumidifier was created by American inventor Willis Haviland Carrier in 1902 to dehumidify a Brooklyn printing plant. Carrier cited the discovery as a reason for further discoveries in air conditioning.

It consists of a heat pump to provide a cold zone to condense humidity and a hot zone to recover the ambient temperature.

Its operation consists of passing a stream of air through an evaporator, which is at a temperature below the dew point, causing ambient humidity to condense and drip into a tank or drain. After being dried and cooled, the air passes through the condenser, thereby recovering the ambient temperature and further reducing its relative humidity.

Sometimes ice may occur in the cold area. In some devices, when it detects that the temperature in the cold zone drops below 0 degrees, the heat pump stops, but the fan continues to move until the ice melts.

It might seem that the process would not alter the ambient temperature, but it does affect it because all the electrical power used by the refrigeration equipment (compressor + fans) plus the latent heat of vaporization of all the condensed water must be dissipated into the environment.

The dehumidifier is used to reduce and control the humidity in the environment, especially in the summer.

It is also used in industrial processes with high-power devices. Thus, in the food industry they are used to prevent the growth of bacteria and protein decomposition in heat-sensitive foods or to accelerate the drying of sausages. They are also widely used by the arms and pyrotechnics industry, in order to guarantee the correct conservation of electronic material, gunpowder and ammunition.

You can find up to 4 types of dehumidifiers: Industrial, desiccant, silent and heating.

Industrial dehumidifiers: Industrial dehumidifiers are those built to perform high-demand jobs. That is, these products have quite robust designs and, generally, incorporate all the most important features, such as: high-capacity water storage tanks, good energy management, among other things.