How to stop condensation forming on windows overnight

Colder weather has arrived and you may already be dealing with one of its calling cards – condensation. Waking in the morning, there’s nothing worse than opening the curtains to misted-up windows. This why knowing how to stop condensation forming on windows overnight is important knowledge to have over winter.

The main reason condensation forms on windows overnight is due to the drop in temperature when the sun sets. Breathing out at night means that stopping condensation on bedroom windows is one of the biggest problems most houses face. Left unchecked condensation on windows can damage window frames and even lead to mould forming around the window.

Here’s everything you need to do to prevent condensation from forming on your windows overnight, according to the experts.

Why does condensation form on windows overnight?

‘Condensation is caused when warm, moist air inside the house comes into contact with the cold surface of the windows. During the night, temperature levels drop making windows colder, and therefore increasing the chance that condensation is going to form,’ explains Nicholas Auckland, heating and energy expert at Trade Radiators.

Bedroom windows are typically the worst affected area as they become quite humid as we sleep. However, kitchens and bathrooms can also be affected, they are areas where moisture builds up from cooking dinner or having a shower.

1. Use a standing fan

One of the best ways to stop condensation from forming is by maintaining a consistent airflow through your home. The simplest way to do this is by opening your windows. However, during winter you may not want to keep your windows open which is where a standing fan comes into play.

‘If you would rather not open your windows in winter or your home lacks an exhaust fan, a standing fan can help circulate air from other areas of your home. Window fans are another great option to limit any buildup of moisture, especially if they’re reversible, allowing you to adjust airflow during winter to further prevent condensation,’ advises Michael Wray, Insulation Expert and owner of National Insulation Supplies.

2. Check for draughts

‘Draughts around windows and doors trap moisture increasing humidity levels, so sealing them is beneficial,’ says Nicholas.

If your window seals are not sufficient, they could also be allowing humid air to seep into the room.

‘Draft-proofing windows and doors with weather-stripping, draft excluders and silicone caulk can help maintain a steady indoor climate and block moisture-laden air from entering, reducing the risk of condensation forming. Additionally, choose weather-stripping that complements your window design for both function and aesthetics,’ says Michael.

Weatherstripping is a material used to seal gaps around doors and windows. It’s typically self-adhesive and made from rubber or silicone. Simply line your window with the stripping to prevent cold air slipping in.

3. Invest in double glazing

Another thing you should check is that your windows are at least double glazed, as single glazed windows often have a greater temperature difference compared to the heat of the room, which causes condensation.

‘The quality of your window can also help. A window’s performance in retaining heat is ranked on U-Values, a measurement of heat loss and the rate at which heat is lost. Single-glazed windows will inevitably cause condensation as they have a high U-Value (usually around 5-6 w/m²K), and are the thinnest part of a wall and have a far lower surface temperature than the rest of the home,’ says o Trotman, Marketing Manager at The Residence Collection.

‘Double glazing and triple glazing are the better options to help reduce the risk of damp as they have an extra layer of protection against the outside and have much lower U-Values too, although triple-glazed are the best option.’

4. Be careful when drying clothes

‘Drying clothes indoors can unknowingly be adding to the condensation problem by releasing more moisture into the home,’ says Stephen Hankinson, a heating expert at Electric Radiators Direct.

‘Make sure to dry your clothes in well-ventilated rooms and avoid doing it in small rooms if you can. Open a window or use an extractor fan when possible to reduce the moisture build-up from your wet clothes.

Investing in a dehumidifier and heated clothes airer is one of the best ways to dry clothes quickly inside if you are short on drying space and unable to leave a window open. But always remember wet laundry can increase the humidity in your home so it’s important to keep your drying area to one room and keep it well ventilated.

5. Invest in a dehumidifier

Investing in one of the best dehumidifiers is a game-changer when it comes to reducing humidity in your home.

‘Dehumidifiers take the excess moisture out of the air, preventing it from building up on windows and help maintain optimal humidity levels in the home,’ says Stephen.

‘Once purchased, they are a cost-efficient way to keep on top of condensation, only costing around 14p to run for an hour.

‘If opening the windows during cold winter months doesn’t appeal to you, purchasing a dehumidifier is a good alternative option when tackling condensation.’

By taking these measures, you can say goodbye to being greeted by condensation on your windows every morning.