Drying Laundry Indoors: The Complete Guide to Prevent Mould

In autumn and winter, the drying rack becomes a permanent fixture. Without a balcony or garden, your home is often the only place to dry laundry. But beware: wet laundry can quickly become an invisible hazard. It releases large amounts of moisture, affecting the indoor climate and, in the worst case, causing mould. With the right techniques, however, you can dry your laundry indoors quickly, efficiently and safely.

This guide explains how to control moisture when drying laundry indoors, actively prevent mould growth and maintain a healthy indoor climate. From choosing the right room and using effective ventilation strategies to helpful aids, you will find everything you need to know.

Why is drying laundry indoors a problem for the indoor climate?

A freshly washed load of laundry may only feel damp, but it contains a considerable amount of water. When it dries on a drying rack, this water evaporates completely into the surrounding air. An average five-kilogram wash load can release two to three litres of water. This additional moisture dramatically increases the relative humidity in the room.

When the air is saturated with water vapour, the moisture seeks out the coldest point in the room, where it condenses. These are typically windows, poorly insulated external walls or corners behind furniture. Permanently damp areas are the ideal breeding ground for mould, whose spores can be harmful to health. A musty smell is often the first warning sign, but by then the mould has usually already spread.

Each wash cycle can quickly add one and a half to four litres of water to the indoor air.

The optimum relative humidity in living spaces is between 40 and 60 per cent. When drying laundry, this level can quickly rise above 70 or 80 per cent. Active moisture management is therefore essential to protect the building and your health.

Which room is best for drying laundry?

Not every room is equally suitable for setting up a drying rack. Choosing the right location is the first step towards preventing mould. Consider the advantages and disadvantages of the different options in your home.

Living room and bedroom

These rooms are usually well heated, which speeds up drying. However, you spend most of your time here. Permanently high humidity can disturb your sleep, cause headaches and affect your general wellbeing. Only use these rooms in an emergency and make sure you ventilate them particularly consistently.

Bathroom and kitchen

The bathroom may seem an obvious choice because it is designed to cope with moisture. However, bathrooms are often small, have no large windows and are already humid from showering or bathing. Without a powerful ventilation system, the bathroom is usually unsuitable. You should avoid the kitchen because the laundry will absorb cooking smells and grease vapour.

The ideal drying room

The best place is a room that you do not use constantly but that is heated and has a window. A guest room, home office or spacious, heated hallway are good options. The key advantage is that you can close the door, preventing humid air from spreading throughout the home. This allows you to focus ventilation and heating on a single area.

The 5 golden rules: How do I dry laundry indoors properly?

With a systematic approach, drying laundry indoors becomes a safe routine. Follow these five basic rules to prevent moisture problems from the outset.

1. Spin the laundry thoroughly

The easiest step starts in the washing machine. The less water remains in the laundry, the less has to evaporate into the room air. Use a high-speed spin cycle, ideally at 1,400 revolutions per minute or more. Modern textiles can easily withstand this. It reduces residual moisture and significantly shortens drying time.

2. Position and load the clothes airer correctly

Do not place the clothes airer directly against a wall or in a corner. Position it as freely as possible in the room so that air can circulate from all sides. Hang the items with enough space between them. Do not overload the airer. It is better to use two smaller airers than one overloaded one. Before putting the laundry on the airer, it is best to sort it into an airy laundry basket to prevent mildew stains. A large model such as the

100L Laundry Basket Laundry Box Laundry Hamper with 3 Removable Handles Bamboo Polyester Cotton Metal Brown+White 52 x 32 x 63

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3 Sprouts Laundry Basket Polar Bear

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3 Sprouts Laundry Basket Octopus

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3. Heat the room moderately

Warm air can absorb significantly more moisture than cold air. Therefore, heat the drying room to a constant temperature of around 20 °C. Do not turn the heating off completely, even at night. A cold room encourages condensation on the walls. The aim is not to overheat the room, but to create a stable, warm environment that supports evaporation.

4. Ventilate consistently and correctly: air the room thoroughly!

This is the most important point. The moisture absorbed by the warm air must be transported outside. Forget leaving the window tilted open – this method is inefficient, wastes heating energy and cools the walls, encouraging mould.

Instead, open the window fully for 5 to 10 minutes (thorough ventilation). Do this every few hours while the laundry is drying. Even more effective is cross-ventilation: open an opposite window or a door to create a draught. This completely replaces the humid room air with fresh air in just a few minutes.

Thoroughly airing a room for a few minutes is much more effective and energy-efficient than leaving a window permanently tilted open. It is the only way to quickly and completely replace stale, humid room air with fresh, dry outdoor air.

5. Keep the door to the drying room closed

Prevent humid air from spreading uncontrollably throughout your home. Keep the door to the room containing the clothes airer closed. This limits the high humidity to one area, where you can heat and ventilate it specifically without affecting the climate in the other rooms.

Which aids help with fast and safe drying?

Sometimes the basic rules are not enough, especially in poorly ventilated homes or on very humid days. Technical aids can significantly speed up the process and make it safer.

Hygrometer for monitoring humidity

A hygrometer is a small, inexpensive measuring device that displays relative humidity. It is an indispensable tool for assessing the situation objectively. Place it in the drying room. If the reading rises above 60%, it is time to ventilate. This helps you develop a feel for the room climate and ventilate when necessary.

Electric dehumidifiers

An electric dehumidifier is the most effective solution for difficult cases. The appliance draws in humid room air and cools it internally, causing the water to condense and collect in a container. The dry air is then released back into the room. This greatly speeds up laundry drying and keeps humidity consistently within the optimum range. They are particularly worthwhile investments in windowless bathrooms or cellars.

Fan for improved air circulation

A simple but effective method is to use a fan. Set it to a low speed and point it at the clothes airer. The constant movement of air breaks up the stagnant, humid layer of air directly around the laundry and speeds up evaporation. This can reduce drying time by several hours. It also makes drying large items such as bed linen easier.

Tumble dryer as an alternative

If space and budget allow, a tumble dryer is the most convenient solution. Modern heat pump tumble dryers are very energy-efficient and gentle on laundry. They solve the moisture problem completely, as the water is either collected in a container or directed straight into the drain. Modern tumble dryers offer special gentle programmes, particularly for delicate fabrics such as those often used in children's bed linen. Looking for new bed linen? Here you can find bed linen available for immediate delivery.

Persistent Myths About Drying Laundry Indoors

There are several misconceptions surrounding this topic that can lead to mistakes. Here, we debunk the most common myths.

Myth 1: “Turning the heating all the way up dries laundry fastest.”

False. Extreme heat alone does not solve the problem. Although the air becomes saturated with moisture, if that moisture is not removed, it condenses even faster on cold walls. A moderate temperature of around 20 °C combined with regular ventilation is the most efficient and safest method.

Myth 2: “Outdoor air is humid in winter and does not help.”

False. This misconception is based on a misunderstanding of relative and absolute humidity. Due to physical limitations, cold air can hold very little water. Even if the relative humidity outside is 90%, this cold air contains far less water in absolute terms than the warm, humid air in your home. When you ventilate, dry cold air flows in, warms up and can then absorb much more moisture. Ventilating in winter is extremely effective.

Myth 3: “Leaving a small gap in the window is enough.”

False. As mentioned earlier, leaving a window tilted open is the worst option. Air exchange is minimal, heating costs increase and the risk of mould around the cooling window reveals grows. Always opt for short, intensive ventilation or create a cross-draught.

Drying laundry indoors is not a problem if you approach it consciously and correctly. With the right combination of spinning, heating and, above all, ventilation, you can protect your home from mould and ensure a healthy indoor climate, even during the cold season.

Frequently Asked Questions

How much water evaporates from a load of laundry?

An average washing machine load containing 5 kg of laundry releases around 2 to 3 litres of water into the room air while drying. This additional moisture must be removed through targeted ventilation to prevent excessive humidity and the resulting risk of mould growth.

Is a tilted window suitable for ventilation?

No, a tilted window is unsuitable and even counterproductive. Air exchange is minimal, while the walls around the window cool down significantly. Moisture condenses particularly easily on these cold spots, increasing the risk of mould and also wasting energy. Short, intensive ventilation is always the better choice.

Which room is best for drying laundry?

Ideally, use a room that is well heated (approx. 20 °C) and easy to ventilate, but is not permanently used as a living room or bedroom. A home office or guest room is a good choice. Keep the door closed so that the moisture does not spread throughout the home.

Does turning the heating all the way up help?

Only to a limited extent. Warm air can absorb more moisture, but that moisture must also be removed from the room. Heating without regular ventilation only increases the absolute humidity in the air. The key is a combination of moderate warmth (approx. 20 °C) and consistent short, intensive ventilation.

Can I dry laundry in a cold basement?

This is not recommended. Cold air can absorb hardly any moisture, so the laundry dries extremely slowly or not at all. Instead, it often develops a musty smell, and the moisture can condense on the cold basement walls, causing mould there too.