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How do you stop condensation on windows overnight in the winter?

Simply raising the temperature in your rooms while leaving windows slightly ajar will allow heat to circulate. Which may tackle your condensation problem, while also ensuring you stay warm as you try to sleep.

envirovent.com - Condensation at Night: What Causes it and How to Prevent it - EnviroVent

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The trouble with condensation

While it might seem that condensation forming overnight isn’t a serious problem – after all, it’s usually gone by midday – the reality is that it indicates a build-up of moisture in the air of your home. That build-up can have serious consequences. Condensation is the most common cause of damp in residential buildings. Especially in older buildings, damp is nearly unavoidable unless preventative measures are put in place. While energy-efficiency is rightly a priority for many homeowners, sealing doors and windows to protect yourself from the cold temperatures outside can exacerbate the risk of damp by reducing ventilation on the inside. Condensation also comes with a health warning. Black mould is one of the most common consequences of a long-term build-up of condensation, and its spores can cause a variety of medical issues, from problems with respiration to infections and serious allergic reactions. Asthma sufferers often experience worsened symptoms in an environment blighted by black mould, and other sensitive residents may experience headaches, fatigue or nausea. Children are especially vulnerable to these issues. If a build-up of black mould has started to form in the bedroom, there is a particularly high risk of breathing in these dangerous spores due to the fact that you will be spending several hours in there at a time as you sleep. On top of that, recurring damp can create a cycle of expenditure on repairs such as re-painting and re-plastering. Even worse, when a damp problem is allowed to progress, damage can result to the structure of your home, especially if your house has a timber frame which may be vulnerable to rot. Unless a preventative approach is taken to condensation build-up, all these problems are virtually guaranteed to recur as soon as night-time temperatures drop below the dew point again.

Take a preventative approach

Rather than mopping up moisture in the mornings and dealing with mould or damp problems as they arise, the best way to tackle the condensation which forms overnight is to prevent it from building up in the first place. Simply raising the temperature in your rooms while leaving windows slightly ajar will allow heat to circulate. Which may tackle your condensation problem, while also ensuring you stay warm as you try to sleep. However, the downside is a significant increase in energy bills.

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Some habits increase the likelihood of condensation forming overnight. For instance, if you tend to dry clothes indoors during the night, that may be causing a build-up of moisture in your home. Similarly, if you sleep with a humidifier on, turning it down may reduce condensation. Depending on your home, there are a range of preventative approaches which may stop condensation from forming overnight. If these quick fixes don’t resolve the problem, the issue will have to be tackled at its source, by removing the excess moisture in the air of your home as it is produced. That means improving ventilation. Probably the most effective way to tackle overnight condensation is with a Positive Input Ventilation system (PIV). A PIV draws outside air through a filtration system into a central unit installed in your house (typically in an attic). From there, the external air is evenly distributed to every room in your house. At the same time, moisture-laden interior air is drawn up and expelled from the house. For those especially concerned about energy efficiency (and the heating bill!), an effective alternative is a Mechanical Ventilation with Heat Recovery (MVHR) system. Similar to a PIV, an MVHR uses a heat exchange in the central unit to re-capture the heat from your home’s internal air: this energy is then used to warm the external air before it is piped into your rooms. MVHR systems are therefore particularly useful for tackling overnight condensation problems, as they provide the additional ventilation you need without taxing your heating system.

Seek expert advice

Expert advice can help you identify the best way to tackle overnight condensation, so contact EnviroVent today to discuss what solutions might be most practicable in your home.

envirovent.com - Condensation at Night: What Causes it and How to Prevent it - EnviroVent