Drying Laundry Indoors? Experts Urge One Key Adjustment to Prevent Mould, Damp, and Health Risks

According to EXPRESS

Introduction: The Winter Drying Dilemma

As autumn deepens and winter looms, UK households find themselves grappling with a seasonal challenge that’s both mundane and serious: drying laundry indoors. With rain, low temperatures, and short daylight hours making outdoor drying difficult or impossible, families often turn to indoor alternatives—hanging damp clothes on radiators, backs of chairs, or laundry racks placed in the nearest available space.

But while these improvisations may feel practical, experts now warn that improper indoor drying can create a perfect breeding ground for mould, damp, and the musty odours that linger long after clothes are folded away. Worse yet, this hidden moisture buildup can affect your health—especially for children, the elderly, and those with respiratory conditions like asthma.

A new set of guidelines shared by Lenor, a UK laundry care brand, offers actionable advice on how households can safely dry clothes indoors without compromising their health—or their home’s air quality.

Moisture, Mould, and Health Risks

Mould growth indoors is not just a cosmetic nuisance. It often signals deeper structural and environmental problems. When wet clothes are hung indoors, especially in poorly ventilated spaces, they release moisture into the air. This airborne water vapour then condenses on cooler surfaces—walls, ceilings, windows—creating damp patches where mould spores can settle and thrive.

One of the most common culprits found in such environments is Aspergillus fumigatus, a fungal species that can trigger allergic reactions, respiratory irritation, and even severe infections in immunocompromised individuals. In homes with poor airflow, spores from fungi like Cladosporium and Penicillium can also circulate for hours, making their way into soft furnishings and air vents.

A study published in Indoor Air journal in 2023 revealed that drying laundry indoors can increase humidity by up to 30%, particularly when combined with insufficient ventilation. This extra moisture not only fuels fungal growth but can also warp wood, peel paint, and create long-term damage to home interiors.

The Key Fix: Choose the Right Spot

According to Lenor’s advice, the most important change households can make is where they choose to dry their laundry indoors.

“When you’re drying clothes indoors, try to position your washing near an open window or somewhere with good airflow,” the guide recommends.

This seemingly simple advice addresses the root of the issue: lack of air movement. Good airflow allows moisture from wet fabrics to dissipate into the outside environment instead of settling onto walls and surfaces. Rooms with extract fans, vents, or frequent airflow from open windows or dehumidifiers are ideal candidates.

In contrast, drying clothes in corners, closets, or tight hallways—areas often cut off from regular airflow—creates damp microenvironments where fungi thrive.

Practical Tips for Mould-Free Drying

The advice doesn’t end with location. Lenor’s full guide offers several additional suggestions to help households combat damp and odours during winter:

1. Use the Fastest Spin Cycle
   After washing, select the machine’s fastest spin cycle to extract as much water as possible before drying begins.
2. Hang Clothes Immediately
   Avoid letting damp clothes sit in the washer or pile up in a basket.
3. Shake and Separate Items
   Hang clothes with at least one inch of space between items to encourage airflow.
4. Create a Dedicated Drying Zone
   Use a ventilated bathroom or utility room with fans or open windows.
5. Use Fabric Conditioner
   To reduce musty odours and keep clothes feeling soft.
6. Avoid Storing Clothes Prematurely
   Ensure garments are completely dry before folding or storing them.

Outdoor Drying Still Possible – With Caution

Some homeowners still prefer to dry clothes outdoors when possible—even during colder months. The guidance acknowledges this, recommending early-day hanging, thorough item spreading, and always checking the weather before attempting this method.

The key is timing: colder air can still evaporate water, albeit more slowly, especially if the sun is out and humidity is low. Even partial outdoor drying can significantly reduce indoor damp risks later.

The Science of Mould and Why It Matters

Fungi like Aspergillus fumigatus, Penicillium, and Cladosporium thrive in environments with high humidity (above 60%), low airflow, and organic material—all of which are present when clothes are dried in enclosed, unventilated rooms.

These fungi reproduce by releasing tiny spores that become airborne. When inhaled, they can lead to:

• Respiratory irritation
• Asthma flare-ups
• Fungal sinus infections
• Severe infections in people with compromised immune systems

A 2022 report by Public Health England linked indoor damp and mould exposure to a 40% increased risk of developing childhood asthma.

Damp Homes and the Broader Energy Dilemma

The issue of indoor clothes drying is also tied to energy use and cost. Many families have cut back on tumble dryer use due to rising electricity prices, turning instead to air drying—whether or not their homes are well-suited to it.

This creates a difficult balancing act: drying laundry efficiently while maintaining indoor air quality and avoiding structural damage from damp.

Expert Advice from Public Health Bodies

Organisations like the NHS and the UK Health Security Agency (UKHSA) echo Lenor’s advice: avoid drying clothes on radiators, improve airflow, and monitor indoor humidity.

The NHS particularly warns against drying laundry in bedrooms, especially for children or people with asthma. Condensation buildup on walls and ceilings can silently lead to long-term mould colonisation behind furniture or wallpaper.

Using humidity sensors (available for under £20) can help families track indoor air conditions and take action before mould becomes visible.

Homeowner Action Plan: A Recap

If you live in the UK and must dry clothes indoors this winter, consider adopting this action plan:

• Always use a fast spin cycle before drying.
• Hang clothes near open windows or use an extractor fan.
• Keep drying areas clean and rotate items regularly.
• Space clothes out to allow airflow between garments.
• Avoid drying in bedrooms or poorly ventilated areas.
• Invest in a dehumidifier or humidity sensor if possible.
• Never store damp clothes—even if they feel “almost dry.”

The Takeaway: Small Habits, Big Impact

The seemingly small act of where and how we dry clothes indoors has significant consequences—on our homes, our health, and even our finances. Fortunately, as this latest guidance highlights, simple adjustments can make a big difference.

Drying clothes in a better-ventilated area—ideally near an open window or extractor fan—costs nothing but offers substantial protection against the silent risks of damp, odours, and mould.

As winter approaches and indoor drying becomes a necessity, making these changes can help households stay not only warm—but also safe, dry, and healthy.

References

• Indoor Air Journal, 2023 study on indoor drying and humidity
• Aspergillus fumigatus – Wikipedia
• Cladosporium – Wikipedia
• Penicillium – Wikipedia
• NHS – Official site
• UK Health Security Agency (UKHSA)

According to EXPRESS

Frequently Asked Questions

How much moisture does indoor laundry drying add to a home?

A standard 5 kg load of wet laundry contains approximately 2–4 litres of water that evaporates into indoor air during drying. This dramatically increases relative humidity in the room: in a typical 20 m² bedroom, a drying load can raise relative humidity from 50% to 80–90% within a few hours if the room is not ventilated. Sustained relative humidity above 70% (particularly at cooler surface temperatures) creates ideal conditions for mould growth within 24–48 hours. UK government research found that homes where laundry is routinely dried indoors without ventilation have significantly higher rates of mould-related problems.

Where is the safest place to dry laundry indoors?

If indoor drying is unavoidable, the safest approach is: dry in the room with the best ventilation (a bathroom with an extraction fan or a kitchen with an external extraction hood); keep an external window open throughout the drying period; run a portable dehumidifier in the drying room (empty the reservoir frequently); avoid drying in bedrooms, living rooms, or any room where people sleep or spend significant time; and spread laundry as widely as possible on a drying rack to maximise airflow around garments rather than bunching them together. Avoid drying directly on radiators, as this creates high localised humidity hotspots and can damage radiators over time.

Does indoor laundry drying cause black mould?

Yes—research has linked routine indoor laundry drying without adequate ventilation to mould growth and elevated airborne mould spore counts. The species most commonly associated with condensation-related indoor mould (Cladosporium cladosporioides, Penicillium species, Aspergillus species, and the notorious Stachybotrys chartarum or ‘black mould’) all thrive under the elevated humidity conditions that wet laundry creates. Studies of homes with mould problems consistently identify indoor drying as a major contributing moisture source, typically alongside inadequate heating and ventilation. Asthma UK has identified indoor laundry drying as one of the most significant preventable triggers of asthma-related mould exposure in UK homes.

Is a condenser tumble dryer as good as a vented tumble dryer for indoor air quality?

For indoor air quality purposes, condenser and heat pump tumble dryers are as effective as externally vented models—and in some ways better. Condenser dryers extract moisture from clothing into a water reservoir that is emptied after each use, while heat pump dryers condense moisture and either collect it or drain it directly. Neither type releases moisture vapour into the indoor environment during operation. Heat pump dryers are the most energy-efficient option (50–60% less electricity than condenser models) and are recommended for both environmental and air quality reasons. The key maintenance task is cleaning the condenser filter and emptying the water reservoir after each load.

What are the long-term health effects of living in a home with poor laundry drying ventilation?

Chronic exposure to the elevated mould spore counts that result from consistently damp indoor environments—including those caused by routine indoor laundry drying—is associated with a range of respiratory health effects. These include increased sensitisation to mould allergens; worsening of existing asthma (mould is a major trigger for asthma attacks); development of new-onset asthma in children; hypersensitivity pneumonitis in susceptible individuals; chronic rhinitis and sinusitis; and recurring respiratory tract infections. The WHO’s 2009 Guidelines for Indoor Air Quality estimated that dampness and mould affect up to 50% of homes in some European countries, representing a major preventable public health burden.