Though some windows are fixed in their frames, most open and close. The parts that move up and down, side to side, or in or out, are called sashes. All types can include the efficient technologies that deliver benefits such as lower household monthly utility bills. These are the most popular options:
Single-hung windows have two sashes: a fixed one in the top half of the window, and a sliding one on the bottom that moves up or down.
Double-hung windows have two sliding sashes. The top sash can be lowered and the bottom sash can be raised, providing the choice of which parts of a window to leave open.
Sliding windows have sashes that slide from side to side. This category includes sliding doors common for yards and patios.
Casement windows have hinges on the sides of their sashes, and open by swinging out or in.
Awning windows have hinges on the top of their sashes, and swing out from the bottom.
Fixed windows don’t open.