Fortunately, modern high-performance external doors are made to be energy efficient, with many built with insulation and materials that keep heat in. The door thickness also plays a large role in energy efficiency, with external door thickness typically ranging from 44mm to 70mm to provide a strong thermal barrier.
Insulated external doors can feature high-density polyurethane foam or solid timber cores to help maintain consistent indoor temperatures. Double and triple-glazing with low-emissivity glass also minimises heat transfer while still allowing natural light to flow into the home. Other popular features like warm edge spacer bars and gas-filled cavities between panes further boost thermal performance, and multi-point locking systems and robust seals also help eliminate draughts and cold air from entering. Whether uPVC, composite or aluminium, today’s external doors are designed not just for security and aesthetics, but also to support low energy bills and improve home comfort.
High Thermal Performance Doors
High thermal performance doors are designed to minimise heat transfer, keeping homes warmer in the winter and cooler in the summer. Energy-efficient materials include uPVC, aluminium and engineered timber, offering excellent insulation, and can be purposefully designed for precise installation, meaning air leakage is minimal. Your home may feature outdated or run-down external doors, so replacing them with modern, high-performance external doors is the smart choice to improve energy efficiency.
U Values
The U value of a door measures the rate at which heat is transferred through the material. The lower the U value, the better the material insulates. A good U value will depend on factors such as:
- Door material
- Type of insulation (e.g. timber or polyurethane foam)
- Thickness of the door
- Any glazing used (e.g. double or triple)
While the U value depends on the features of the doors themselves, external factors can play a role in determining the value. For example, the position of energy-efficient doors can affect performance.
- North-facing doors: Less direct sunlight provides more stable temperatures throughout the year but will be colder overall due to minimal solar gain.
- South-facing doors: Receive the most sunlight, providing natural warmth and light, helping to reduce heating demand in cooler months. However, prolonged UV exposure can cause fading and warping and contribute to overheating in warmer months without proper insulation.
- East-facing doors: Enjoy morning sunlight with less intense heat exposure. The drawbacks mean it will be cooler in the afternoon and evening, which may reduce comfort later in the day.
· West-facing doors: These offer the same benefits and disadvantages as east-facing doors, but in reverse.
Choosing the Right Door for Your Home
Now you know what makes energy-efficient front doors, does the style of the door affect thermal performance? There are many modern, popular choices for UK homes, with each having an impact on both aesthetics and energy efficiency. Each type offers unique advantages depending on your space and insulation needs.
Bifold
Bifold doors open fully to connect indoor and outdoor spaces, using multiple folding panels. Bifold doors can feature thermal breaks and double glazing to retain heat and promote energy efficiency.
Sliding
Sliding doors provide wide views and are ideal for saving space. Modern designs feature insulated frames and high-performance glazing to prevent heat loss.
uPVC panels
Highly popular, uPVC panel doors are a cost-effective and naturally insulating choice. They resist warping and help maintain consistent internal temperatures.
Composite doors
Composite doors are made from several materials which provide enhanced strength and security, as well as offering excellent thermal performance thanks to thick insulated cores.
uPVC and composite materials can also be used to create distinct styles, like stable doors that offer traditional and charming aesthetics, and heritage doors with classic French styling.
Replacing Your Front Doors
Thankfully, energy-efficient doors aren’t hard to come by, but finding a company that ensures quality installation and door replacement can be trickier. That’s where we come in at Haus Installations – we’re a leading door replacement company in the West Midlands, here to help make your home more energy efficient. We install various styles of high-quality external doors to match your home. If you’d like us to leave you with a quote or want to discuss our services, reach our team here.
