One features of contemporary exterior doors can be allow air circulation without the entry of insects and animals; take the outside temperature at specific times of the year, among others. For thermal insulation, especially during winter, usually one is chosen whose contemporary exterior doors or other metal faces and having an inner layer of polyurethane insulating both. This separates the temperatures inside and outside, preventing internal heat out, and to enter into external cold. Other metal doors in their faces have a central core or fiberglass, which achieves an adequate thermal insulation, and takes heat from the outside to complement the home heating system.
Contemporary exterior doors of glass, acrylic or other, usually colorless, have a high internal heat loss. Therefore, they are ideal for places with warmer climates, allowing you to enter the heat when necessary, and to remove it from inside out house when the weather is nicer. But they are not suitable for cold climates it all. Their frames may be metal (suitable for cities with antioxidables treatments), heavier, achieving better trap heat. They can also be plastic, which does not retain heat; they are lighter and better resist moisture.