Mould and air quality

Dehumidifiers: Myths About Mould in Small Flats

Discover the truth about dehumidifiers and their role in combating mould and damp in small flats and studio apartments.

Updated 7 December 2025 Garden Gear Guide guide for UK homes

Living in a small flat or studio apartment can come with its own unique set of challenges, particularly when it comes to managing humidity levels. Many residents find themselves battling visible mould and musty smells, which can significantly affect the comfort and air quality of their living space.

Despite the increasing popularity of dehumidifiers, there are numerous misconceptions surrounding their use. In this article, we aim to debunk some of the most prevalent myths about dehumidifiers and their effectiveness in controlling mould and dampness.

Myth 1: Dehumidifiers Are Only for Large Spaces

One common myth is that dehumidifiers are only suitable for larger homes. This is simply not true. Dehumidifiers are available in various sizes and capacities, making them ideal for small flats and studio apartments. In fact, using a dehumidifier in a compact space can be more effective, as the device works to reduce humidity levels quickly and efficiently.

For small living spaces, look for portable dehumidifiers that can easily be moved from room to room, ensuring that every area gets the benefit of reduced humidity.

Myth 2: Mould Only Grows in Damp Environments

While it’s true that mould thrives in damp environments, it can also grow in areas with high humidity levels, even if there is no visible water damage. Many small flats lack proper ventilation, which can lead to increased humidity and, consequently, mould development.

Using a dehumidifier helps control humidity, reducing the potential for mould growth even in seemingly dry conditions. Regularly monitoring humidity levels with a hygrometer can also help you stay ahead of potential mould issues.

Myth 3: Dehumidifiers Are Unnecessary If You Use Ventilation

Ventilation is indeed an essential factor in preventing mould growth, but relying solely on it may not be enough, especially in small spaces where airflow can be limited. Factors such as cooking, showering, and even breathing contribute to indoor humidity levels.

Dehumidifiers complement ventilation efforts by actively removing excess moisture from the air. This combination is particularly effective in maintaining a healthy indoor environment.

Myth 4: All Dehumidifiers Are the Same

Not all dehumidifiers are created equal. There are various types, including refrigerant, desiccant, and thermoelectric models, each with its pros and cons. Understanding these differences is crucial for selecting the right unit for your specific needs.

  • Refrigerant dehumidifiers: Best for larger spaces and warmer climates; they work by cooling the air to condense moisture.
  • Desiccant dehumidifiers: Ideal for cooler environments; they absorb moisture through a chemical process.
  • Thermoelectric dehumidifiers: Compact and more energy-efficient, suitable for small spaces, but less effective in high humidity.

Choosing the right type for your flat can significantly enhance mould prevention efforts.

Myth 5: Dehumidifiers Will Completely Eliminate Mould

While dehumidifiers are effective in controlling humidity and preventing mould growth, they do not eliminate existing mould. If you already have mould in your home, it’s essential to remove it physically before deploying a dehumidifier.

Use appropriate cleaning solutions to scrub affected areas, and ensure that the environment remains dry afterwards. Once you have addressed any existing mould, a dehumidifier can help prevent its return.

Myth 6: Dehumidifiers Are Too Noisy for Small Flats

Many people shy away from purchasing a dehumidifier due to concerns about noise. However, many modern dehumidifiers are designed to operate quietly, making them suitable for small flats where noise can be more noticeable.

When selecting a model, look for units with a low noise rating, often measured in decibels (dB). This ensures that your dehumidifier runs efficiently without disturbing your daily activities or sleep.

Myth 7: Running a Dehumidifier Is Too Expensive

Some individuals believe that running a dehumidifier will significantly increase their energy bills. While it’s true that dehumidifiers consume electricity, many energy-efficient models are available that won’t break the bank.

To give you a clearer idea, operating a dehumidifier for several hours a day may cost around £10–£20 per month, depending on your energy rates and the model’s efficiency. This cost is often outweighed by the benefits of improved air quality and the prevention of costly mould damage.

Myth 8: Dehumidifiers Only Benefit Those with Allergies

While individuals with allergies or respiratory issues may see significant benefits from dehumidifiers, these devices can improve air quality for everyone. Reducing humidity levels helps eliminate dust mites, mould spores, and other allergens that can affect overall health.

Even if you do not have allergies, maintaining a comfortable humidity level can lead to better sleep, improved concentration, and a more pleasant living environment.

Frequently asked questions

How do I know if I need a dehumidifier?

Signs include visible mould, musty smells, condensation on windows, and high humidity levels. A hygrometer can help you measure humidity.

Can a dehumidifier get rid of existing mould?

No, a dehumidifier cannot eliminate existing mould. You’ll need to clean it off surfaces before using a dehumidifier to prevent further growth.

How often should I run my dehumidifier?

It’s advisable to run your dehumidifier continuously in damp conditions and during humid weather. Adjust usage based on your flat’s humidity levels.

Are dehumidifiers safe to use in small spaces?

Yes, dehumidifiers are safe for small spaces, especially when you choose a model with a low noise level and proper safety features.

What is the ideal humidity level for my flat?

The ideal indoor humidity level is typically between 30% and 50%. Use a hygrometer to monitor and maintain this range.

Do dehumidifiers require maintenance?

Yes, regular maintenance includes cleaning the water tank, checking filters, and ensuring proper airflow to keep the unit functioning efficiently.