This article is only relevant in Sweden and is a direct translation.
With a dehumidifier you can keep it relative humidity at a level where microbial fouling cannot be developed. It makes a big difference in moisture-prone environments such as crawl spaces, cold attics, garages, storage rooms and laundry rooms. In risky structures such as crawl spaces and cold attics, for example, a desiccant dehumidifier is an excellent option for keeping moisture levels under control.
The type of dehumidifier that is most suitable depends mainly on the temperature, size and tightness of the space. Here are the most common options.
The condensation dehumidifier is based on cooling technology and works in four stages:
The advantages are low energy consumption in hot environments, easy, mobile installation and low purchase price. The disadvantage is lower efficiency in cooler areas and the risk of ice formation on the cooling coils. In addition, the container must be emptied at regular intervals.
Condensation dehumidifiers are therefore mainly used in heated basements, laundry rooms, pool rooms, garages and storage rooms where the temperature is above 15 °C.
In desiccant dehumidifier is based on the adsorption method and work in a continuous process:
| Concept | Description of the programme |
|---|---|
| Process air | Humid air from the space to be dehumidified. |
| Wet air | Moisture-saturated air stream that transports the water vapour away via a wet gas hose. |
| Dry air | Dry, slightly heated air that is diffused back into the space. |
The advantage of a desiccant dehumidifier is that it can operate continuously and maintain a constant capacity even at low temperatures. This makes the technology very effective in cold and uninsulated spaces. This is why desiccant dehumidifiers are often used in spaces colder than 15 °C - such as crawl spaces, cold attics, boats, caravans, holiday homes and cold storage.
There is also a large industrial need, for example in containers, laundries, museums, production facilities and warehouses. Here you can read more about our professional dehumidifier.
The installation of desiccant dehumidifiers is fixed, and the control is often done via a control panel that should be placed in a visible position so that you can easily follow the climate in the space. Read more about how to installs a desiccant dehumidifier.
The thermal dehumidifier is based on the principle of heat:
The advantages are simple construction and few moving parts. The disadvantage is that the whole space has to be heated, which requires a lot of energy. As the principle is based on heating the whole space, some parts may become dry while others are still damp.
A hygrodynamic dehumidifier uses fans and negative pressure to create air change in the space, often by supplying drier outside air when conditions are favourable. This method works well during periods of dry outdoor air, but during rainy or humid periods in summer and autumn, the effect is limited.
The hygrostat is the brain of the dehumidifier - it works much like a thermostat, but for humidity. It measures the relative humidity in the room and ensures that the dehumidifier does not run unnecessarily. This keeps the humidity level constant while reducing energy consumption.
In modern desiccant dehumidifiers, the hygrostat is usually built directly into the unit. In a model like the EvoDry RCF 12 or EvoDry RCF 20 it records both temperature and relative humidity. This allows the dehumidifier to be controlled based on mould index - a method that takes into account the fact that mould, bacteria and rot fungi find it harder to grow when temperatures are low. The result is more precise control and better energy efficiency.
To choose the right dehumidifier, it is important to consider several factors: the temperature, the size of the space, how tight it is and how the moisture gets in.
Not sure what you need? We're here with expertise to help you find the right solution. We also work with certified partners who can assist with inspection and installation. At the moment ROT deduction temporarily increased to 50% until 31 December 2025, so now might be a good time to take advantage of it!
