Differences Between Single and Double Hung Windows and Picture Windows

Picture Windows

• Fixed windows that do not open are known as picture windows. These make an outdoor view resemble a picture hanging on the wall. A picture window can be cut to fit any size or shape of opening to create an architectural accent or to bring light and a picturesque view inside.

Single-Hung Windows

• Single-hung windows have one moving part, called a sash. These windows typically consist of a fixed upper portion and a bottom sash that slides up and down to open the window. These windows only create an opening half the height of the window, but they still provide more airflow than a fixed picture window.

Double-Hung Windows

• Double-hung windows consist of two halves that slide to open. In vertically installed windows the top and bottom sashes both slide up and down to open the window. For horizontally installed windows or large sliding glass patio doors, the two halves of the window can slide back and forth along the track of the window for more opening options.

Energy Efficiency

• Of all three types of windows, picture windows are the most energy-efficient, especially if they are designed with a single pane, according to "Energy-Efficient Building" by "Fine Homebuilding." Numerous panes on a window, called lites, increase the chances that air could leak out of the window. Double-hung windows with two moving sashes are most at risk for heat seepage from a house since this type of window has numerous seams. Single-hung windows are slightly more energy-efficient. To ensure the efficiency of multiple-pane windows, opt for double-paned windows. These use two pieces of glass for each pane to create a barrier against heat loss from your home.