A single-hung window is composed of one fixed sash on top along with a movable sash in the base. A double-hung window consists of two sashes that traveling vertically in stations independently of each other. Both of these types are the most frequent residential windows.
Chris Hill
This illustration details a single-hung window. The top sash is fixed, while the bottom sash moves.
Present Works Construction Inc..
Double-hung windows give you more options for altering the airflow.
Degnan Design Group + Degnan Design Build
Windows can be worked into architecture.
More: Learn more about double-hung windows