Energy efficiency is crucial to the modern home, and by extension the doors around it. There are several reasons for this. To start, building regulations demand that external doors can contain a certain amount of heat in your home. If your French doors open out onto a sufficiently robust conservatory, this might be less of a concern, but for most of us, it is. Another important consequence of having an energy efficient home, however, is that it’ll save you money. The less heat escapes from your property, the less energy you’ll need to spend generating heat to replace it, and the lower your energy bills will be. Finally, it’s worth considering the environmental cost of using all that extra energy. If your doors are leaking a lot of heat, you'll end up using more heat trying to keep the inside of your house warm. For the most part, this energy will come from burning fossil fuels which contribute to man-made climate change.