How to Dry Clothes Indoors in Winter Without Causing Damp

Why Indoor Drying Causes Damp in Winter

In winter, cold walls and closed windows mean moisture from drying clothes has nowhere to go, leading to condensation and mould.

When wet clothes dry, they release moisture into the surrounding air. In summer, open windows and warmer temperatures allow this moisture to dissipate naturally. In winter, closed windows and cold surfaces trap the moisture indoors [S2].

Cold walls are particularly problematic. When warm, moist air from drying clothes contacts a cold external wall, the air cools and cannot hold as much moisture. This causes condensation on the wall surface, which can lead to mould growth within days [S1]. The UK Health Security Agency identifies laundry drying as a significant contributor to indoor humidity during winter months.

• A single load of washing can release 2-5 litres of water into the air as it dries
• Cold external walls below dew point cause condensation
• Closed windows prevent moisture from escaping
• Mould can begin to grow within 24-48 hours on damp surfaces
• Indoor humidity above 60% significantly increases condensation risk [S1]

Best Room to Dry Clothes in Winter

The kitchen is often the best room for indoor drying due to extractor fans and warmer temperatures from cooking.

The kitchen tends to be the warmest room in the house, with heat from cooking and often an extractor fan that can remove moist air directly [S1]. If you have a kitchen-diner, this is an ideal space as there is usually room for a clothes airer and good airflow.

Avoid drying clothes in bedrooms, particularly those with external walls. Bedrooms are typically cooler, and the added moisture can cause condensation on windows and walls, leading to mould near the bed [S2]. If you must dry in a bedroom, use a dehumidifier and keep the door closed.

• Kitchen: warmest room, has extractor fan, good airflow
• Bathroom: extractor fan available but limited space
• Utility room: ideal if ventilated and heated
• Living room: acceptable if dehumidifier is used
• Bedroom: avoid if possible due to cold walls and health concerns [S2]

Using a Dehumidifier for Clothes Drying

A dehumidifier is the most effective tool for drying clothes indoors without causing damp, costing 30-80p per load.

Place the dehumidifier as close to the clothes airer as possible, ideally within 1-2 metres [S1]. Close the room's doors and windows to create a sealed space. Set the dehumidifier to its lowest humidity setting or use the dedicated laundry mode if available.

Run the dehumidifier continuously until clothes are fully dry, typically 6-12 hours depending on the load size and dehumidifier capacity [S1]. A 200W dehumidifier running for 8 hours at 26.32p per kWh costs approximately 42p. This is significantly cheaper than a tumble dryer, which typically costs £1-2 per load.

• Place dehumidifier within 1-2 metres of the clothes airer
• Close all doors and windows in the room
• Set to lowest humidity or laundry mode
• Typical drying time: 6-12 hours
• Running cost: approximately 30-80p per load depending on dehumidifier wattage [S3]

Why You Should Not Dry Clothes on Radiators

Drying clothes on radiators traps moisture in the air and can cause damp, mould, and higher heating costs.

It may seem logical to dry clothes on a warm radiator, but this approach is counterproductive [S2]. The heat from the radiator speeds up evaporation, releasing moisture rapidly into the air. With windows closed, this moisture has nowhere to go and condenses on cold surfaces.

Draping clothes over radiators also reduces the radiator's efficiency. The fabric acts as insulation, preventing heat from entering the room [S2]. This means your central heating system runs longer to reach the thermostat setting, increasing your energy bills. You end up paying more for heating and still have a damp problem.

• Rapid evaporation from radiators floods the room with moisture [S2]
• Moisture condenses on cold walls and windows
• Clothes insulate the radiator, reducing heating efficiency
• Increases energy bills as heating runs longer
• Can lead to mould growth within days in winter

Ventilation Tips for Indoor Drying

Brief daily ventilation helps exchange humid air without losing too much heat from your home.

Even with a dehumidifier, some ventilation is beneficial. Open a window in the drying room for 10-15 minutes each day to exchange stale, moist air with fresh outdoor air [S2]. In winter, outdoor air holds less moisture, so even brief ventilation helps.

If you have trickle vents on your windows, keep them open. These provide continuous background ventilation without significantly affecting room temperature [S2].Extractor fans in kitchens and bathrooms should be used whenever drying clothes nearby.

• Open a window for 10-15 minutes daily in the drying room
• Keep trickle vents open for continuous background ventilation
• Use kitchen and bathroom extractor fans when clothes are drying
• Close internal doors to contain moisture in the drying room
• Avoid drying clothes in multiple rooms simultaneously

Cost Comparison: Indoor Drying Methods

Using a dehumidifier to dry clothes is significantly cheaper than a tumble dryer and avoids the damp problems of radiator drying.

The three main indoor drying methods have very different costs. Radiator drying appears free but increases heating bills and risks damp damage. A tumble dryer costs £1-2 per load in electricity. A dehumidifier costs 30-80p per load and extracts moisture rather than adding it [S3].

Over a typical winter season (October to March), drying 4 loads per week, a dehumidifier costs approximately £28-62 compared to £104-208 for a tumble dryer [S3]. The dehumidifier also eliminates the damp and mould risks associated with other indoor methods.

• Dehumidifier drying: 30-80p per load
• Tumble dryer: £1-2 per load
• Radiator drying: no direct cost but increases heating bills and risks damp
• Annual winter cost (4 loads/week): dehumidifier £28-62, tumble dryer £104-208 [S3]
• Dehumidifier can be used year-round for condensation control

Frequently asked questions

Bottom line

Drying clothes indoors in winter without causing damp is achievable with the right approach. Use a dehumidifier alongside a clothes airer, choose a warm room like the kitchen, open a window for 10-15 minutes daily, and never dry clothes on radiators. This method costs 30-80p per load, significantly less than a tumble dryer, and eliminates the damp and mould risks of other indoor drying methods.