How to Stop Mould Before It Takes Over Your Home This Winter

With the Cape’s winter rains approaching and unseasonably late rainfall continuing across other parts of South Africa, many households are shutting windows, turning on heaters and drying laundry indoors more often.

The problem is that all of this creates the perfect environment for one unwelcome winter guest: mould.

Humidity is often associated with hot summer weather, but damp indoor air can become just as problematic during colder months. In many cases, winter conditions actually make the issue worse.

As warm indoor air meets colder surfaces such as windows and walls, condensation begins to form. Add limited ventilation, closed-up rooms and everyday activities like showering, cooking and drying clothes indoors, and moisture quickly starts building up inside the home.

“Mould grows when moisture and poor airflow come together,” explains Trevor Brewer, Director at Solenco. “During colder, wetter weather, we tend to keep our homes sealed, and everyday activities like showering, cooking, and drying clothes indoors add moisture that has nowhere to escape.”

The signs are often easy to miss at first. Mould can appear as black, green, brown or white spots, dark stains or fuzzy patches. Sometimes paint begins peeling or wood starts warping. In other homes, the only early warning sign is a lingering musty smell that never quite disappears.

It commonly develops behind furniture, inside cupboards, around windows and on ceilings or walls where condensation collects most frequently.

Beyond the visible damage, mould can also affect wellbeing. Some people experience coughing, sneezing, blocked noses or irritated eyes, while others notice headaches, skin irritation or persistent throat discomfort. Children, older adults and people with asthma, allergies or weakened immune systems are often more sensitive to these conditions.

One of the clearest indicators that mould may be present is when symptoms improve after spending time away from home.

But while many people attempt to clean visible mould once it appears, Brewer says that only addresses the symptom rather than the cause.

“The real issue is the moisture in the air that allows it to grow in the first place,” he explains.

This is where dehumidifiers play a significant role. By removing excess moisture from the air, they help prevent the condensation that creates ideal conditions for mould growth.

“Dehumidifiers are often thought of as appliances, but they’re really home protection systems, and people buy them to solve real problems,” says Brewer. “A quality dehumidifier removes hidden moisture before it becomes visible damage or a health concern.”

Modern systems are also becoming more advanced in how they manage airflow and humidity across larger spaces.

Brewer points to newer-generation systems like the MeacoDry Arete Two 20L, designed to regulate humidity consistently across multiple rooms rather than only the immediate surrounding area. The system also includes medical-grade HEPA filtration aimed at improving overall indoor air quality.

“It’s not just about extracting moisture near the dehumidifier,” Brewer says. “It’s about circulating air effectively, so that dampness is quickly reduced throughout the home.”

Ultimately, controlling humidity is less about comfort alone and more about preventing long-term problems before they start.

“If you stop the humidity, you stop the mould,” Brewer adds. “It’s about creating a healthier, more comfortable indoor environment, no matter what the weather is doing outside.”