Double-pane windows have two glass panes, usually separated with an inert insulating gas, such as nitrogen, krypton, or argon. Sometimes called double-glazed windows, double-pane windows can help save money on heating and cooling costs, lower outdoor noise pollution, reduce condensation, and prevent cold-air drafts. Compared to single-pane windows, they can also diminish carbon emissions. Additionally, they are more energy efficient than single-pane windows, as they provide a higher level of insulation. According to Angi and HomeAdvisor, the cost of dual-pane windows ranges from $150 to $6,900, with the national average at $900. The pricing depends on the scope of the project, window size, window-frame material, type of glass, and any additional issues that may arise during installation, especially with older homes. Depending on how the window professional charges, labor can cost from $100 to $300 per double-pane window or $40 to $75 per hour. Keep in mind that large or complex installations can significantly raise the price of labor for the window installation project.