How air is dehumidified
and purified at home

Technology that controls humidity, reduces the risk of mold, and improves indoor air quality over time.

How Humidity Affects the Indoor Environment

Humidity affects both indoor air and building materials. When humidity levels are not kept in balance, problems can arise that affect both the environment and the structure over time.

  • High humidity increases the risk of mold, microbial growth, and harmful emissions
  • Moisture is stored in building materials such as wood, concrete, and insulation if not removed
  • Controlled dehumidification stabilizes the indoor climate over time

Techniques for dehumidifying indoor air

Indoor air dehumidification mainly uses two technical principles: sorption dehumidification and compressor-based dehumidification.

Sorption dehumidification is primarily used where temperatures are low or where the moisture load is constant, while compressor dehumidification is optimized for heated environments with normal room temperature and high air exchange rates.

Desiccant dehumidification – dehumidification in three steps

  • Moist air is led into the dehumidifier

    Air with high humidity is drawn into the unit and directed towards a hygroscopic sorption material that has the ability to bind water molecules.

  • Moisture is bound in the desiccant material

    The water vapor is adsorbed into the material's structure, which directly lowers the air's relative humidity – even at low temperatures.

  • The material is regenerated

    The sorption material is heated to remove and expel the moisture, while dry air is returned to the space for increased circulation.

Compressor dehumidification – three-step dehumidification

  • Moist air is cooled

    Humid indoor air is drawn in and passed over a cold surface where the temperature is lowered.

  • Condensation forms

    When the air cools down, the water vapor condenses into liquid, which is collected in a container or drained away.

  • Dry air is returned to the room

    The drier air is easily heated and blown back into the room, gradually lowering the humidity.

Differences between various types of dehumidification

Desiccant dehumidification

Desiccant dehumidification


Applications

Cold and damp-exposed spaces such as crawl spaces, attics, and unheated basements.

Temperature

-15 - 35 °C

Installation

Permanent installation for continuous and long-term operation.

Air purification

Active air purification removes mold spores, odors, and airborne particles.

Dehumidification principle

Desiccant dehumidification: moisture is physically bound in a hygroscopic material (rotor) and then removed.

Compressor dehumidification

Compressor dehumidification


Area of use

Heated spaces such as laundry rooms, garages, and residential areas.

Temperature

5 - 35 °C

Installation

Portable – easily moved between different rooms.

Air purification

Active air purification removes mold spores, odors, and airborne particles.

Dehumidification principle

Condensation dehumidification: the air is cooled below the dew point so that moisture condenses into water

Desiccant dehumidification
Compressor dehumidification
Applications
Cold and damp-exposed spaces such as crawl spaces, attics, and unheated basements.
Area of use
Heated spaces such as laundry rooms, garages, and residential areas.
Temperature
-15 - 35 °C
Temperature
5 - 35 °C
Installation
Permanent installation for continuous and long-term operation.
Installation
Portable – easily moved between different rooms.
Air purification
Active air purification removes mold spores, odors, and airborne particles.
Air purification
Active air purification removes mold spores, odors, and airborne particles.
Dehumidification principle
Desiccant dehumidification: moisture is physically bound in a hygroscopic material (rotor) and then removed.
Dehumidification principle
Condensation dehumidification: the air is cooled below the dew point so that moisture condenses into water

Dehumidification and air purification

Ozoneair dehumidifiers are equipped with integrated air purification. The dehumidification lowers humidity, while the air purification simultaneously neutralizes airborne pollutants.

  • Neutralizes mold spores and microorganisms released by high humidity
  • Reduces odors and chemical emissions in indoor air
  • Improves air quality throughout the space, even after humidity levels have stabilized

Common questions about dehumidification and humidity

Dehumidification means that excess moisture is removed from the air to create a stable and healthy indoor climate. By lowering the humidity, the risk of mold, odors, moisture damage, and microbial growth in both air and building materials is reduced.

The difference lies in how moisture is removed and in which environments each technology works best.

  • Desiccant dehumidifiers work effectively in cold spaces and are often used in crawl spaces, attics, and unheated basements.
  • Compressor dehumidifiers are most effective in heated spaces such as laundry rooms and living areas and are often portable.

Excessive humidity creates favorable conditions for mold, bacteria, and unpleasant odors. Moisture can also accumulate in building materials such as wood, concrete, and insulation, increasing the risk of long-term damage. Controlled dehumidification contributes to a more stable and healthier indoor climate.

No, not always. Dehumidification lowers the moisture level, but airborne pollutants such as mold spores, odors, and chemical emissions may remain. Therefore, a dehumidifier with integrated air purification provides more complete protection for both air and building.

Air purification neutralises mould spores, microorganisms, and odours that are often released during moisture problems. When dehumidification is combined with active air purification, both the cause (moisture) and the consequences (polluted air) are addressed.

Dehumidification is particularly needed in spaces with limited ventilation or high moisture loads, such as:

  • Crawl spaces and attics
  • Basements and storage rooms
  • Laundry rooms and garages
  • Holiday homes and seasonal residences

Yes. By maintaining humidity at a controlled level, the conditions mould needs to grow are prevented. In combination with air purification, the spread of mould spores in the air is also reduced.

The choice depends on temperature, application, and whether the installation is permanent or portable.

Generally:

  • Cold, moisture-prone areas → desiccant dehumidification
  • Heated areas with varying needs → compressor dehumidification

Safe and proven dehumidification

Ozoneair dehumidifiers are designed for safe and long-term operation in Nordic environments.
All models combine effective dehumidification with integrated air purification for a stable indoor climate.