Double-pane windows, also known as dual pane windows, come with two panes of glass. These panes are separated from each other by a spaced filled with air. That air traps winter's colder temperatures or summer's heat in between the two windows and forms a barrier that blocks the heat and cold from affecting your home.

How do you tell if a window is single or double paned?

Method 1: Look at the inside edge of the window. If you see two panes of glass separated by a small spacer system, then it's a double glazed window. If you see one pane of glass and no spacing system, then it's single glazed. Method 2: Open the window and use your fingers to touch both sides of it in the same spot.

What do double paned windows do?

What is a Double-Pane Window? Double-pane windows contain two panes of glass separated by a space of air or gas that helps to slow the transfer of heat and cold. Because gas is denser than air, insulating gas is more energy efficient than air. The two gasses typically used in double-pane glass are Argon.