Single and Double Hung
A double hung window is made of two independent sashes, one at the bottom and one at the top. These can slide up and down in separate channels.
A single-hung window is much like it’s double-hung cousin, except that the top sash is fixed while the bottom sash is free to move up and down.
One advantage of both single and double hung windows is that the sashes can either be tilted or removed completely to allow for easy cleaning.
The main disadvantage of these types of windows is that they may not provide as much insulation benefit as other styles can. The sliding operation of the sashes means that gaps are possible around the whole window.
These windows are ideal for traditional houses such as those with colonial and Victorian style architecture. These windows are often located one by one and their typically vertical proportions match well with taller structures