Humidity and Condensation on Cold Surfaces in a Small Area

Humidity and condensation are common issues that can affect any living space, but they are particularly prevalent in small areas such as tiny homes, apartments, and office spaces. Understanding what these phenomena are, why they occur, and how to combat them can help maintain a comfortable and healthy indoor environment.

 What is Humidity?

Humidity refers to the amount of water vapour present in the air. It is usually expressed as a percentage, known as relative humidity, which indicates the amount of moisture in the air relative to the maximum amount the air can hold at a given temperature.

Types of Humidity:
Absolute Humidity: The total amount of water vapour in the air, regardless of temperature.
Relative Humidity: The ratio of the current absolute humidity to the highest possible absolute humidity at that temperature.

What is CondensationDefinition:
Condensation is the process by which water vapour in the air is changed into liquid water. This typically happens when warm, humid air comes into contact with a cold surface, causing the moisture in the air to cool and condense into water droplets.

Common Cold Surfaces:
– Windows
– Mirrors
– Metal surfaces
– Walls, especially those facing the exterior

Why Does Condensation Happen?

Condensation occurs because of the differences in temperature between the air and the surfaces within a space. When warm, humid air hits a colder surface, it cools down. Since cooler air holds less moisture than warm air, the excess moisture is released in the form of liquid water.

Factors Contributing to Humidity and Condensation

1. Poor Ventilation:
Inadequate airflow can trap moisture inside, leading to higher humidity levels.

2. Daily Activities:
Cooking, showering, and even breathing release moisture into the air.

3. Temperature Differences:
Cold outdoor temperatures can make indoor surfaces, especially those near the exterior, cooler and more prone to condensation.

Ways to Combat Humidity and Condensation

1. Improve Ventilation:
Use Exhaust Fans: Install exhaust fans in kitchens and bathrooms to remove excess moisture.
Open Windows: Regularly opening windows helps to increase airflow and reduce indoor humidity.

Ventilation Systems:

Consider installing a mechanical ventilation system to ensure consistent air exchange.

2. Control Indoor Temperature:
Keep indoor surfaces warmer and reduce condensation.
Heating: Maintain a consistent indoor temperature to minimize the temperature difference between the air and surfaces.

3. Reduce Moisture Sources:
Dehumidifiers: Use dehumidifiers to extract excess moisture from the air.
Moisture Absorbers: Place moisture-absorbing materials like silica gel or calcium chloride in areas prone to dampness.
Cover Pots: Use lids when cooking to minimize steam release.

4. Use Condensation Control Products:

Window Treatments: Use double-glazed or insulated windows to keep window surfaces warmer and less likely to condense.

5. Regular Maintenance:
Check for Leaks: Regularly inspect for and repair any leaks in plumbing, roofs, and walls.
Clean Gutters: Ensure gutters and downspouts are clear to prevent water buildup around the foundation.


Managing humidity and condensation is crucial for maintaining a healthy and comfortable indoor environment, especially in small spaces where these issues are more pronounced. By understanding the causes and implementing effective strategies, you can reduce moisture problems and protect your home or space from the potential damage and health issues associated with high humidity and condensation. Regular maintenance, proper ventilation, and the use of dehumidifiers and heating are key to keeping your space dry and comfortable.

Useful links for products to tackle condensation:

1.Ausclimate 10L Desiccant Dehumidifier
  • Suitable for room sizes up to 50m² or 125m³
  • Efficient cold-climate operation (down to 1°c)
  • Nano silver filter (kills viruses & bacteria on contact)
  • Laundry mode (simple one-touch economical clothes drying function)
  • 10L of moisture extraction per day

This premium 10 litre per day small-size/BIG-POWER model is compact & lightweight yet powerful in performance with a high desiccant moisture removal capacity. An all-in-one dehumidifier & dryer; a premium choice in desiccant dehumidifiers. It has a nano silver filter to kill those nasty viruses and bacteria on contact. It will efficiently operate in the cooler climates (down to 1°C).

This model has a dedicated one-touch laundry mode with auto swing louvers for air flow direction control and faster drying. This machine is lightweight and has a fold down carry handle to make is easy to move from room-to-room around the home.

2. Wall Vents