Timber bifold doors and casement windows

At Timbawood, we are usually asked how our windows can keep the heat IN – and we have a range of solutions that insulate windows to reduce heat loss.

But what happens when temperatures rise and we need our windows to help keep the heat OUT?

As sunlight comes through windows, it can make indoor temperatures soar, causing discomfort and health issues. When temperatures rise and the sun shines down on our homes, it’s vital to keep the inside cool.

Thankfully, there are simple ways to stop heat from coming in through windows. Good window insulation prevents your home from getting too hot in the summer, saving energy and keeping things comfortable.

In this guide, we cover a range of solutions to help keep your home cool in our increasingly hot summers.

1. Seal gaps to block heat from entering your home

It’s important to consider the flow of air on a hot day. A straightforward yet effective method to prevent heat intrusion through your windows is by sealing any gaps, ensuring that cool air remains indoors while hot air stays outside. Using weatherstripping (draught-proofing) is a practical solution to seal these gaps, effectively preventing air leaks and maintaining a comfortable indoor temperature.

If you have sash windows, be sure to open the top sash as well as the bottom sash. This will help to create a circular current of air, so that hotter air can flow out of the top sash as it rises.

2. Use blinds to keep your home cool

Blinds are great for keeping your home cool in hot weather. Closing them during the sunniest times of the day helps stop heat from getting inside. For even better results, choose blackout blinds. They block almost all sunlight and keep your home cooler. Blackout blinds also have a special side that reflects sunlight, keeping heat out. Some, like cellular shades, have a unique design that traps air and stops heat from coming in through the windows.

3. Upgrade to double glazing

Double glazing is better than single glazing at keeping the heat out. If you touch a single glazed window on a hot day, the glass will feel quite warm. This is because double glazing has an inert gas between the two panes of glass, which is a poor transmitter of heat. So when there is a temperature difference between the inside and outside of a building, either when the building is warmer than outside during the winter, or colder than outside on a hot summer day, the gas helps prevent the heat transferring either way. The more inert a gas is, the less heat will be transferred. That is why we choose particularly inert gases, such as Krypton and even Xenon, for our slim double glazing.

4. Use low emissivity glass

Single glazing allows a significant amount of heat energy from the sun to pass through the glass, resulting in high solar gain. To address this issue, our double glazing is equipped with a Low E coating on the inner pane. Low E, short for “low emissivity”, glass is specially coated to minimise solar gain compared to clear glass. This coating serves a dual purpose: it reflects the sun’s heat away from the building during hot weather and helps retain heat inside the building during winter, contributing to energy efficiency year-round.

5. Try solar control glass

For commercial properties, or south facing homes with bifold doors, it is possible to use ‘Solar Control’ glass to reduce solar gain even further to avoid overheating. This glass usually has a more mirror-like, reflective quality or tint to it. This is often seen in office blocks and conservatory roofs; they feature a lot of glass and therefore rely on Solar Control glass to regulate the temperature.

6. Use window films for heat reflection and UV protection

Window films offer a low cost solution for heat reduction and UV protection. By applying window films to your windows, you can effectively reflect heat away from your home, keeping interiors cooler and more comfortable. Additionally, these films serve as a barrier against harmful UV rays, safeguarding your furnishings, flooring and artwork from fading and damage.

Blocking heat from entering your home through windows is essential for maintaining a comfortable indoor environment, particularly during hot weather. Whether you opt for simple DIY solutions or invest in a more long term solution, taking proactive steps to keep your home cool not only improves comfort but also contributes to sustainability and cost savings in the long run.

If you’re looking to replace your timber windows, we specialise in the finest single and double glazed sash windows and casement windows for period properties in London and the Home Counties.

If you’d like to find out more about the many options available, or you would like a free quote, please get in touch to speak to one of our specialists on 0208 893 4889.