In the UK, we long for sunshine most of the year. But in true Brit style when summer does finally arrive and temperatures soar, we’re not so happy when our homes can quickly become hot and stuffy.
Unfortunately, most UK houses aren’t built for hot weather, so when the temperature creeps up it’s important to take simple steps to improve airflow and keep your home cool.
If you’re wondering how to increase ventilation in your house, or whether to keep windows open or closed in summer, these tips will help you boost air circulation, reduce indoor heat, and create a more comfortable living environment.
1. Open and close your windows at the right time of day
The most common question in hot weather is: Should I keep my windows open or closed in summer? And the answer? Well, both. But it’s timing that’s key.
It may seem logical to crack your windows opening during the day when the sun is at its hottest. However, opening your windows lets hot air flood in, and actually makes your home even warmer.
Instead, keep your windows closed and curtains drawn to block out the heat. Then, once the outside temperature drops in the evening or early morning, open your windows to let cooler air flow in and refresh your space – perfect for making bedtime more bearable.
2. Use the chimney effect to boost air circulation
The chimney effect is a simple but effective way to improve ventilation in your home, and it’s been used in hot climates for centuries. This technique relies on the natural movement of air: cool air enters at a low point and pushes warm air up and out through higher openings.
How to create a chimney effect at home:
- Open a window on the coolest, lowest side of your home.
- Open another window on the hottest, highest side; ideally upstairs or near the ceiling.
- Place a fan pointing outward in the upper window to help draw warm air out.
This creates a steady, natural flow of fresh air, which is just what you need on warm, still days.
3. Close curtains or blinds on south-facing windows
South-facing rooms get the most sunlight throughout the day. While this is great in winter, in the summer it can quickly turn into an uncomfortable problem.
Large south-facing windows and conservatories end up acting like greenhouses, trapping hot air inside.
To help reduce this effect you can:
- Close your curtains or blinds during the hottest part of the day.
- Invest in some blackout blinds or thermal-lined curtains for extra insulation.
- If you’re making home improvements, consider switching to solar control glass to help reflect additional heat.
4. Check your windows and doors for repairs
If your windows and doors are poorly sealed or stiff, it can unintentionally hinder airflow and make it difficult to properly ventilate your home.
If your windows don’t open fully, won’t stay open safely, or let in draughts during winter, it might be time for repairs. Fixing hinges, seals, or frames not only helps improve summer ventilation but also boosts insulation and energy efficiency year-round.
5. Make the most of trickle vents (if you have them)
Many modern windows include trickle vents; small openings at the top of the frame that allow a low level of fresh air into your home, even when the windows are closed.
These are a godsend in summer when you want a constant background airflow without fully opening windows (ideal for security or if you live on a noisy road). If your windows don’t have trickle vents, you could explore retrofit options or upgrades when the time comes to replace them.
Improving air circulation at home doesn’t need to be complicated. With the right techniques, from opening windows at the right time to using natural airflow methods like the chimney effect, you can reduce stuffiness, improve indoor air quality, and keep your home cooler throughout the summer months.
FAQs
Should I leave my windows open or closed during a heatwave?
Keep them closed during the hottest hours of the day to block warm air, and open them in the evening when it’s cooler outside.
How can I improve airflow in a house with poor ventilation?
Use the chimney effect, keep internal doors open, install extractor fans where needed, and make use of trickle vents.
What are the benefits of opening windows at home?
Opening windows helps reduce indoor humidity, expel stale air and pollutants, and bring in fresh air, especially when timed correctly.
