Double glazed windows consist of two panes of glass separated by a space filled with air or gas, which acts as an insulator. This design helps to reduce heat loss in winter and keeps homes cooler in summer, making them energy-efficient. Additionally, double glazing can help minimize noise from outside, providing a quieter indoor environment. These windows are also more secure than single-pane options, as the extra layer of glass makes it harder for intruders to break in. Overall, double glazed windows offer comfort, energy savings, and enhanced security for homeowners.