A hot spell can change how a home feels very quickly. The bedroom that is normally comfortable suddenly feels stuffy at midnight. The kitchen warms up after one meal. Loft rooms, conservatories and south-facing spaces can become difficult to use for large parts of the day.
This summer has already shown why overheating is becoming a more practical homeowner issue. During the June 2026 heatwave, the Met Office reported new provisional June temperature records across parts of the UK, including very warm overnight temperatures that gave some homes little chance to cool down properly [1].
The good news is that heatwave-proofing a home does not always mean installing expensive air conditioning. Small changes to shading, ventilation, layout and daily habits can make rooms feel much more manageable.
Stop Heat Before It Gets In
The simplest rule is also the easiest to forget: it is usually better to keep heat out than try to cool the room down afterwards.
During the hottest part of the day, close curtains, blinds or shutters on windows that get direct sun. This is especially useful for south-facing and west-facing rooms, where afternoon and evening sun can build up heat just as people are trying to relax or sleep.
Energy Saving Trust advises closing windows and curtains during the day to keep heat out, then opening windows at night or early morning when the air outside is cooler. It can feel odd to close a window on a hot day, but if the outside air is warmer than the room, leaving it open may simply bring more heat inside.
If you have roof windows, large patio doors or a glass-heavy extension, shading becomes even more important. Roof lights can let in a surprising amount of heat, and rooms with large areas of glass can behave a bit like a greenhouse. External shading, awnings or even temporary fabric shading can all help reduce the amount of sun hitting the glass before it warms the room.
Use Cooler Air At The Right Time
Ventilation works best when there is actually cooler air to bring in.
In the early morning, late evening or overnight, open windows on different sides of the home if it is safe to do so. This can create a cross-breeze and help move trapped warm air out. Internal doors can also make a difference. Leaving them open during cooler periods may allow air to move through the property more freely.
During the day, the opposite may be more useful. Keep hot rooms closed off where possible. If one bedroom gets the worst of the afternoon sun, closing the door can stop some of that heat spreading into the hallway or nearby rooms.
This is particularly helpful in homes where one space overheats more than the rest. A loft room, box bedroom or glass extension may need a different routine from the cooler side of the house.
Fans Help People, Not Rooms
A fan can make a hot room feel much more bearable, but it is worth understanding what it is doing. Fans do not usually lower the temperature of the room itself. They move air across your skin, which helps you feel cooler.
That still makes them useful. Fans are generally the cheapest cooling appliance to run, while portable air conditioning units can cost much more to use over a 24-hour period.
For everyday use, a simple fan may be enough, especially if it is used in the room you are actually sitting or sleeping in. Positioning also matters. A fan near an open window in the evening can help move cooler air through the room. During the day, it may be more useful pointed towards the people in the room rather than left running in an empty space.
If you are using a portable air conditioning unit, make sure it suits the room size and that the exhaust pipe is properly sealed where it leaves the window. Otherwise, warm air can leak back in and make the unit work harder.
Focus On The Rooms That Cause The Most Problems
Not every part of the home needs the same treatment. Start with the rooms that affect daily life most.
Bedrooms are usually the priority. If a room is too hot to sleep in, look at blackout blinds, lined curtains, external shading, lighter bedding and whether the windows can be opened safely at night. If the room has a roof window, it may need specialist shading because heat can build quickly under the roof.
Kitchens are another common problem area. Ovens, hobs, dishwashers and tumble dryers all add heat. On very hot days, using smaller appliances, cooking earlier, choosing cold meals or running appliances later in the evening can help keep the room more comfortable.
Living rooms with large windows may benefit from layered shading. A curtain or blind inside the room can help, but shading the outside of the glass often reduces heat more effectively. Even a temporary sail shade or awning can make a noticeable difference where patio doors or bifolds get direct sun.
Think Longer Term If The Same Rooms Overheat Every Year
If the same room becomes uncomfortable every summer, it may be worth looking beyond quick fixes.
Insulation is often thought of as a winter improvement, but it can also help slow heat entering the home in summer. Energy Saving Trust compares insulation to a thermal mug: it slows heat movement, helping homes stay warmer in winter and cooler in summer [2].
Solar film, shutters, awnings and better blinds can also help, particularly for windows that receive strong sunlight. These are not always cheap, so it makes sense to prioritise the rooms that cause the biggest problem. A main bedroom, home office or family living area may deserve attention before less-used spaces.
Planting can also help over time. Trees, climbers, pergolas and shaded seating areas can reduce direct sun around parts of the home and make outdoor space easier to use during hot spells. This is not an instant fix, but it can make the property feel more comfortable over future summers.
A More Comfortable Home, Not A Perfect One
Most UK homes were not designed with repeated extreme heat in mind. That means a completely cool home may not be realistic during a heatwave, especially in upstairs rooms or properties with lots of glass.
The aim is to make the home more liveable. Keeping direct sun out, using cooler night air, choosing fans carefully and focusing on the worst rooms can all help. The small habits matter: closing curtains before the room heats up, avoiding the oven at the hottest point of the day, and opening windows when the air outside finally cools.
If you are already planning home improvements, overheating is worth adding to the list of things to think about. A room that feels bright and spacious in spring can feel very different in a heatwave. A few practical changes now may make the next hot spell much easier to live with.
Source Data
[1] Met Office, June 2026 Heatwave: A Recap Of The Temperature Records, https://www.metoffice.gov.uk/blog/2026/june-2026-heatwave-a-recap-of-the-temperature-records
[2] Energy Saving Trust, How To Keep Your Home Cool In Hot Weather, https://energysavingtrust.org.uk/tips-to-keep-home-cool-this-summer/
