When the sun finally breaks through the clouds in Bristol, it’s a cause for celebration. However, as many of us discovered during the record-breaking heatwaves of recent years, our homes aren't always equipped to handle the rising temperatures. If you’ve ever found yourself sweltering in your living room or struggling to sleep in a stifling bedroom, you might be surprised to learn that your windows and doors are often the primary culprits.
At BS15Doors & Windows Ltd, we’ve spent over 25 years helping homeowners across Bristol, Bath, and South Gloucestershire improve their homes. While most people think of double glazing as a winter essential for "keeping the heat in," modern, high-performance glazing is actually one of the most effective ways to keep the heat out during the summer months.
In this guide, we’ll explore the science behind how our 'A' rated windows and doors regulate temperature, helping you maintain a cool, comfortable home without the need for expensive air conditioning.
The Science of Staying Cool: How Energy Efficiency Works in Summer
It is a common misconception that double glazing only works in one direction. In reality, an energy-efficient window acts as a two-way barrier. To understand how new windows keep your home cool, we need to look at two key technologies: Low-E Glass and Thermal Breaks.
1. Low-E Glass: The Invisible Shield
Most of the heat that enters your home in the summer comes from solar radiation. Standard glass allows this heat to pass straight through, creating a "greenhouse effect" where the temperature inside climbs far higher than the temperature outside.
Modern windows are fitted with Low-Emissivity (Low-E) glass. This features a microscopic, transparent coating that reflects infrared light (heat) back towards its source. In the winter, it reflects your home’s heating back into the room. In the summer, it reflects the sun’s burning rays away from your glass, significantly reducing solar heat gain.
2. Thermal Break Technology
While glass is the largest part of a window, the frames play a massive role in temperature regulation. Older aluminium or metal frames were notorious for "conducting" heat, meaning the frame itself would get hot and radiate that heat into your home.
Today, our aluminium windows and doors feature thermal breaks. This is an insulating barrier placed inside the frame that disrupts the path of heat. It ensures that even if the outside of the frame is baking in the Bristol sun, the inside remains cool to the touch.
Why Your Old Windows are Making Your House a Greenhouse
If your current windows were installed more than 15 years ago, they are likely working against you during a heatwave. Older double glazing often lacks the advanced gas fills (like Argon) and the reflective coatings that are now standard.
According to industry data, up to 35% of unwanted heat gain in a home occurs through windows and doors. This is particularly problematic for homes with large south-facing windows or conservatories. By upgrading to modern 'A' rated units, you can reduce this heat gain by a significant margin.
Key benefits of upgrading include:
- Reduced Overheating: Maintain a stable internal temperature, even during 30°C+ days.
- Lower Energy Bills: If you use fans or portable AC units, you’ll find you need them much less often.
- Better Sleep: Keeping bedrooms cool is essential for a good night's rest during the summer.
- UV Protection: Low-E glass filters out harmful UV rays, preventing your furniture, carpets, and artwork from fading in the sun.
Choosing the Right Products for Summer Comfort
Different areas of your home have different needs. As a family-run business, we take pride in offering honest, no-pressure advice on which products will best suit your specific property and lifestyle.
uPVC and Aluminium Windows
Whether you prefer the classic look of uPVC windows or the sleek, slim sightlines of aluminium, both offer exceptional thermal performance. For modern homes in areas like Emersons Green or Bradley Stoke, aluminium is often favoured for its strength and ability to support larger panes of glass without compromising on cooling efficiency.
Bifold and French Doors: Master Your Airflow
One of the best ways to cool a house quickly is through "cross-ventilation." Bifold doors are the ultimate summer upgrade. By fully folding back an entire wall of your home, you can create an incredible airflow that moves hot air out and draws cooler air in.
Even when closed, our bifold doors are designed with high-spec glazing that keeps the heat at bay. You can learn more about how bifold doors transform Bristol homes in our dedicated guide.
Composite Doors: A Cool Welcome
Don't overlook your front door. A traditional timber door can warp or "move" in extreme heat, leading to draughts or sticking. A high-quality composite door is built with a dense, insulating core that provides a massive barrier against external heat, keeping your hallway noticeably cooler.
Creating a "Cooling Strategy" for Your Home
While new windows and doors are the heavy lifters, we always recommend a holistic approach to summer comfort. Pair your new installations with these tips:
- Purge the Air: Open windows at opposite ends of the house in the early morning and late evening when the air is coolest.
- Shade is Your Friend: Use blinds or curtains on south-facing windows during the hottest part of the day (12 pm – 4 pm) to give your glazing an extra hand.
- Upgrade the Conservatory: If your conservatory is currently a "no-go zone" in July, consider a conservatory upgrade with modern solar-control glass.
Why BS15Doors & Windows Ltd is Bristol’s Trusted Choice
We know that home improvements are a significant investment. That’s why we focus on quality workmanship and honest pricing. We don’t believe in high-pressure sales tactics; we believe in providing the best solution for your home at a competitive price.
- Local Expertise: We serve Bristol, Kingswood, Yate, Chipping Sodbury, Keynsham, Bath, and all surrounding areas. We know the local property styles and the challenges they face.
- Family-Run Values: Our business is built on our reputation. We treat every home with the respect it deserves, ensuring clean and professional installations.
- Finance Options: We offer flexible finance options to help you spread the cost of your home improvements, making energy efficiency accessible for everyone.
- Fully Certified: We are FENSA registered, ensuring all our installations meet the highest building regulations and standards.
(Please note: We specialise in full supplies and installations. We do not offer repair services or cat flap installations.)
Transform Your Living Space Today
Don't spend another summer struggling with the heat. Upgrading your windows and doors is a smart investment that pays off year-round: keeping you cool in the summer, warm in the winter, and reducing your energy bills throughout the seasons.
Ready to see the difference for yourself?
We offer free, no-obligation quotes for homeowners across the Bristol region. Our friendly team is here to help you choose the right style and specification for your home.
Get in touch with BS15Doors & Windows Ltd today and let's make your home a cool sanctuary this summer.
