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Hygrostat. An automatic regulator that allows you to maintain a certain humidity in the room. Such a regulator constantly monitors the amount of moisture in the air and turns on the dehumidifier if this amount exceeds the set value, and when the humidity drops to the desired value, it turns off the unit. The hygrostat is especially convenient in those cases when it is necessary not to dry the air as much as possible, but simply to lower the humidity to a certain level. And since dehumidifiers are most often used precisely for such tasks, this function is also very popular in them — it is available in most models, regardless of the purpose.
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Fan speed adjustment. A regulator that allows you to change the speed of the fan built into the dehumidifier — and, accordingly, the actual value of the air flow (see above). This function allows you to adjust the air flow value — and therefore the performance of the unit — to the specific situation. For example, when there are a lot of people in the room, it makes sense to increase the speed; and if there are few or no people at all, you can reduce the fan speed, reducing power consumption and wear on the unit.
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Night mode. Special operating mode designed for night time. Usually, in this mode the device reduces the fan speed, thereby reducing noise.
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Ionizer. Ions
...are electrically charged molecules. It is believed that the presence of negatively charged ions in the air has a beneficial effect on the health and general well-being of a person. To saturate the air with such ions, ionizers are used in dehumidifiers.
— Shutdown timer. The presence of a timer in the dehumidifier that turns off the device after a certain time set by the user. This function allows you to leave the dehumidifier on without worrying about its timely shutdown — this will happen automatically after the specified time has elapsed. The timer is indispensable in cases where you need to leave the room being dried, but there may not be an opportunity to return and turn off the dehumidifier manually — for example, if you need to close the pool at night, and the air humidity is still too high.
— Anti-freeze mode. A function that prevents excessive cooling of the dryer parts and the formation of a large amount of ice on them. Recall that all modern dehumidifiers (except for adsorption ones, see "Suitable for") have refrigeration systems — to remove excess heat generated during humidity concentration. In some cases, individual components of such systems can cool down strongly (down to sub-zero temperatures), which is undesirable both in itself and due to the formation of ice. To avoid this, the anti-freeze system constantly monitors the state of the evaporator and, if necessary, turns on the heating, preventing a critical drop in temperature and removing the ice that has formed.
— Drying clothes (turbo mode). The intensive air dehumidification mode with maximum performance of the device will come in handy when drying clothes and linen. It helps remove excess moisture during frequent washing. This ensures dehumidification without controlling the humidity level using a hygrostat (see the corresponding paragraph).
— Air filter. Built-in air filter, thanks to which the dehumidifier can further clean the air during operation. Note that the efficiency of such filters can be different — from the simplest systems for trapping dust and other mechanical contaminants to charcoal elements that can even cope with odours. This nuance, as well as the features of filter maintenance, should be clarified separately.
— Filter indicator. Indicator signalling the need to replace the working element in the air filter. Without timely replacement of consumables, the filter at best loses its efficiency, at worst it increases the load on the dehumidifier, or even starts releasing substances into the air instead of trapping them. Replacement indicators may differ in functionality. However, this function significantly reduces the likelihood of missing the next filter maintenance period.
— Tank indicator. An indicator showing the amount of water in the condensate collection tank. The simplest version of such an indicator is a transparent insert in the tank wall, which allows you to monitor the amount of water without opening the tank once again; there are also more advanced systems, up to electronic sensors with display readings. However, anyway, the tank indicator makes it much easier to keep track of the amount of water and reduces the likelihood of missing a critical fill level.
— Auto shutdown. A system that monitors the amount of water in the condensate tank and automatically switches off the dehumidifier when this amount reaches a critical value. It avoids both floods and breakdowns of the unit itself.
— Drainage. Possibility of permanent removal of water, "extracted" from the air, outside the device (for example, directly to the street through a special tube). It allows you to simplify the cleaning of the water tank or do without it at all, which has a positive effect on the dimensions and weight of the dehumidifier. In addition, it makes it possible to work almost continuously, without interruptions to empty the tank with collected water, which is especially important for models used in swimming pools (see "Suitable for").
— Drain pump. Pump for forced drainage from the water tank. Often, the presence of a pump is justified in industrial dehumidifiers, when it is necessary to organize the removal of drainage on an ongoing basis (including, if necessary, its removal to a height of up to several metres).The display provides the user with additional information about the operation of the dehumidifier: it can show various current settings (hygrostat, shutdown timer, etc.), data from indicators (for example, tank filling or filter replacement), error messages, etc. Thus, the control of the device is more convenient and intuitive. This feature is only available for electronically controlled models (see above).
