A thermally efficient door is essential to your home, as this is one of the most common areas for heat loss. With our doors we try to ensure that your new composite door is as efficient as possible starting with the foam core added to this the option to include a thermal glass upgrade. This deflects cold air better than the standard where argon gas is used between the glass panes and warm edge spacer bars to seal the units. The thermal glass upgrade is available on the vast majority of our glass designs.