Do Bifold Doors Help Keep Your Home Warm All Year Round?

How Bifold Doors Keep the Heat In

Earlier generations of bifold doors were often criticised for allowing heat to escape, especially when made from older aluminium profiles without proper insulation. Today, however, modern designs have come along way and are a massive step forward compared to these early generations.

Thermally efficient and modern bifold doors use what’s known as a thermal break, a layer of insulating material between the inner and outer aluminium sections of the frame. This barrier massively reduces heat transfer, ensuring the warm air inside your home doesn’t escape through the metal frame, effectively improving thermal retention.

Combined with high performance double or triple glazing, these doors act as a powerful insulator. The glass units contain argon gas between panes and low-emissivity (Low-E) coatings, both of which reflect heat back into the home while allowing natural light to pass through. The result is a set of insulated bifold doors that retain warmth in the winter and prevent overheating in the summer.

The Role of Glazing in Energy Efficiency

The glass in your bifold doors has a huge impact on overall thermal performance.

Modern double glazed bifold doors typically feature two panes of glass separated by a sealed gap filled with inert gas. This design slows down the movement of heat and cold through the glass. For even better insulation, triple glazed bifold doors add a third pane, increasing efficiency and helping achieve extremely low U values (a measure of how well a material prevents heat loss).

In fact, well engineered bifold doors can now match or even exceed the insulation performance of many traditional windows. With U values as low as 1.2 W/m²K, they meet, and often beat, current Building Regulations Part L requirements for energy efficiency.

Weatherproofing for Year Round Comfort

Keeping your home warm isn’t just about thermal insulation; it’s also about keeping the weather out.

Our high quality weatherproof bifold doors are designed with multi layered seals and compression gaskets that create a tight barrier when the doors are closed. This prevents draughts, moisture, and cold air from seeping through, even during harsh winter conditions.

In summer, these same seals help maintain a stable internal temperature by blocking warm air from entering. As a result, your new bifold doors support consistent thermal comfort all year round, cool in summer and cosy in winter.

The All-Season Benefit of Bifold Doors

Bifold doors aren’t just practical in the warmer months when you can open them fully to connect your home and garden. Their energy-efficient design means they’re also ideal for winter, creating a bright, inviting space without compromising on warmth.

The ability to maintain consistent internal temperatures means you’ll rely less on central heating and cooling systems. Over time, that translates into lower energy bills and a smaller carbon footprint, a win for both your wallet and the environment.

Style Without Compromise

Modern bifold doors have come a long way from their early designs. Thanks to cutting-edge materials, advanced thermal engineering, and weather-sealed construction, they now provide exceptional insulation and year-round performance.

Whether you choose aluminium, uPVC, or composite frames, today’s energy-efficient bifold doors let you enjoy beautiful views and seamless living, without sacrificing warmth or increasing your energy bills.

With expert installation from CTG Windows, you can be confident your home will stay warm, efficient, and welcoming, whatever the season.