When Should I Use A Dehumidifier?

A Dehumidifier is used to extract moisture from the air, providing and maintaining a more comfortable and healthy indoor environment.

Extracting excessive moisture helps to prevent issues including mould growth or musty odours, which are commonly found in homes where there is inadequate ventilation.

A dehumidifier operates on the principle of condensation. It mimics the natural process of dew formation, where warm air containing moisture comes into contact with a cooler surface, causing the moisture to condense into water droplets.

3 Key Elements of a Dehumidifier

There are 3 key elements that work in tandem: a fan, a refrigeration system, and a collection container.

1. The Fan:
The fan in a dehumidifier plays a dual role. Firstly, it draws in moist air from the surrounding environment. Secondly, it circulates this air through the unit, ensuring that it comes into contact with the other essential components to facilitate the dehumidification process.

2. Refrigeration System:
The heart of the dehumidifier lies in the refrigeration system, which typically includes a compressor, evaporator coils, and a condenser. The fan directs humid air over the cold evaporator coils. These coils rapidly cool the air, causing the moisture to condense into water droplets. The condensed water then collects on the coils before dripping into a collection container or a drainage system.

3. Water Collection Container:
The water extracted from the air is collected in a container that needs to be manually emptied. Regularly emptying the collection container is essential to maintain the dehumidifier’s efficiency and prevent leakage or flooding.

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How To Maintain An Efficient Dehumidifier

Humidity Control:

Dehumidifiers often come equipped with a humidity control feature that allows users to set their desired humidity level. Once this level is reached, the unit automatically cycles on and off to maintain the chosen humidity and avoid excessive or unnecessary use.

Energy Efficiency and Environmental Impact:

Many modern dehumidifiers are designed with energy-efficient features such as programmable timers and smart sensors that adjust the settings based on ambient humidity, and energy-efficient compressor technology.


Dehumidifiers contain filters that require regular cleaning or replacing (model dependent) to ensure optimal performance. As the dehumidifier pulls in air, the filters capture airborne particles, dust, and allergens. Over time, filters will become clogged with debris, which then reduces the efficiency of the dehumidifier.

Desiccant Dehumidifier

A desiccant dehumidifier operates in a different way to the more common refrigerative dehumidifiers. While refrigerative dehumidifiers use a cooling process to condense and remove moisture from the air, desiccant dehumidifiers use a desiccant material to absorb moisture.

3 Key Elements of a Desiccant Dehumidifier

1. Desiccant Material:
The core component of a desiccant dehumidifier is the desiccant material, such as silica gel, zeolite, and activated alumina.

These materials have the ability to adsorb (not absorb) moisture from the air, effectively pulling water molecules from the surrounding environment.

Absorption and Desorption Process:
Moist air is pulled into the unit and drawn to the desiccant material. As the air comes into contact with the desiccant, the moisture in the air adheres to the surface of the desiccant, causing the air to become drier.

After the desiccant material has absorbed moisture, it goes through a regeneration or desorption process. This involves either heating the desiccant or exposing it to a low-pressure environment. As a result, the desiccant releases the captured moisture, and this moisture-laden desiccant air is typically expelled outside.

Exhaust Air:
The exhaust air from the desiccant dehumidifier is typically warmer and drier than the incoming air. In some designs, the warm, moist air from the desiccant can be ducted outside, ensuring that the indoor air remains dry.

Desiccant dehumidifiers are typically used in industrial settings, commercial spaces, or  specialised air control areas.


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