What Temperature Should You Keep Your Home to Avoid Mould?

Winter’s here, and with it comes a dilemma every UK homeowner knows too well: how warm is warm enough?

Turn the heating down too low, and you’re risking condensation, damp, and that dreaded black mould creeping up your walls. Crank it up too high, and you’re watching your energy bills spiral out of control.

So what’s the sweet spot?

The expert recommendation: 

According to the Energy Saving Trust and the World Health Organisation, the ideal temperature for UK homes during winter is between 18 to 21 degrees Celsius.

More specifically:

• Living rooms: 21°C

• Bedrooms: 18°C

• Bathrooms: 22°C (when in use)

This range keeps your home warm enough to prevent condensation and mould growth, while still being energy-efficient.

Why does temperature matter for mould?

Mould thrives in cold, damp conditions. When warm air inside your home meets cold surfaces (like windows, walls, or unheated corners), it creates condensation. That moisture is a breeding ground for mould spores.

By maintaining a consistent temperature throughout your home, you reduce the temperature difference between air and surfaces – which means less condensation and less mould.

The key word: consistent

Here’s where many people go wrong. Switching your heating on and off throughout the day creates temperature fluctuations that make condensation worse. For mould prevention, maintaining a steady temperature is key.

Special considerations

Some households need warmer temperatures:

• Elderly people often need 21°C or higher, as they’re more vulnerable to cold

• Babies and young children need warmer environments

• People with limited mobility may struggle to generate body heat through movement

• Anyone with health conditions should prioritise warmth over cost savings

If you fall into any of these categories, don’t compromise on warmth. Instead, focus on making your heating as efficient as possible.

Other ways to prevent mould

Maintaining the right temperature is crucial, but it’s not the only factor:

Ventilate properly – Open windows for 10-15 minutes daily, even in winter 

Use extractor fans – Especially in kitchens and bathrooms 

 Dry clothes outside – Or use a vented tumble dryer 

Keep furniture away from walls – Allow air to circulate 

Wipe down condensation – Don’t let it sit on windows or surfaces 

 Insulate properly – Warm walls mean less condensation

The heating efficiency question

Keeping your home at 18-21°C consistently is only affordable if your heating system is efficient.

Old storage heaters, inefficient gas boilers, or poorly controlled electric heaters can make maintaining steady temperatures expensive. Modern electric radiators with smart thermostats, like the NEOS radiator, are designed to hold consistent temperatures efficiently – heating quickly when needed and releasing stored warmth gradually.

The key is responsive, controllable heating that doesn’t waste energy overshooting your target temperature.

The bottom line

If you’re struggling with mould, condensation, or damp, check your thermostat first. Aim for 18-21°C consistently throughout winter, with special attention to vulnerable household members who may need it warmer.

Your home should be warm enough to prevent condensation, but not so hot that you’re wasting energy (or money). Get the temperature right, add proper ventilation, and you’ll keep mould at bay all winter long.

Trust Electric Heating operates throughout the UK, helping homeowners create warm, healthy, energy-efficient homes. Want advice on the best heating solution for your property? 

Get in touch today on 0800 5999 109 or email us at [email protected].

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