July 22, 2025

How to avoid condensation in a humid room?

Simple and effective solutions to avoid condensation and regulate humidity in a room, naturally or with a dehumidifier.

Why should condensation be avoided?

Condensation occurs when humidity in the air comes into contact with a cold surface (glass, wall, ceiling), causing water droplets to form. It can promote the appearance of mold, damage your walls and damage your health.

To avoid condensation, the relative humidity in the air must be reduced. This can be done in two complementary ways:

  • Capture and absorb humidity (passive action, without electricity).
  • Condenser water vapor (active action, requiring electricity).

Here are the three types of solutions that exist to achieve this.

1. Natural moisture absorbers

There are several natural products that can capture some of the ambient humidity:

  • Baking soda
  • Coarse-salt
  • Clay
  • Charcoal

These solutions are accessible, ecological and simple to implement. They are well suited for small humid areas or for slight humidity problems. However, their effectiveness remains limited, and they are generally not sufficient in case of significant condensation.

2. Commercial moisture absorbers

Silica gel and desiccant bags

Desiccant bags, silica beads or silica gels are effective solutions for capturing humidity in the air in small enclosed spaces. They are often found in electronic packaging, cupboards, cellars or storage boxes. Their effectiveness is proven, but limited in time: you must remember to renew them regularly.

Moreover, the absorption of water in these products is relatively slow, so they will not be very effective for very rapid variations in relative humidity.

These products are particularly useful for avoiding condensation in confined environments where ventilation is limited.

Salt moisture absorbers

These products contain calcium chloride (CaCl₂), which can absorb large amounts of water. Above a certain quantity, calcium chloride becomes liquid, flows into a container provided for this purpose and must be discarded.

Like desiccant bags, salt must be renewed very regularly and absorption is not very fast.

Air Sponge: an efficient and sustainable solution

Our product Air Sponge is a more efficient solution than conventional bags. It combines high absorbency, rapid absorption, long duration of action and simplified use.

Air Sponge is designed to provide effective humidity control in living rooms, vehicles, business premises or storage spaces. Thanks to its technology, it captures excess humidity passively, without electricity, and neutralizes unpleasant odors.

💡 Ideal for preventing condensation in areas subject to temperature variations.

3. Electric moisture absorbers (capacitors)

When humidity is caused by significant inflows of liquid water (infiltrations, capillaries, very humid walls), it is necessary to switch to active solutions: electric absorbers or dehumidifiers.

These devices condense water vapor and transform it into liquid, which is recovered in a tank. They are particularly effective in drying out a damp wall, reducing ambient humidity or even limiting condensation on the ceiling.

Conclusion: what solution should you choose against condensation?

Choosing the right solution depends on the cause and extent of the phenomenon. Conventional solutions, such as silica bags or gels, or salts need to be changed regularly, while dehumidifiers consume electricity. On the other hand, Air Sponge offers a sustainable and economical alternative, without energy consumption.

In case of doubt, a humidity tester or a professional moisture meter can better assess the situation. Do not hesitate to ask a professional for advice for a complete diagnosis.

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