Double hung windows have a large following, and are growing in popularity as more manufacturers begin to offer them. Compared to single hung windows, double hung windows provide more ventilation. This is because on a double hung window, both the top and bottom sashes can be operated by moving them up and down, whereas only the top sash is operable in a single hung window.
When it comes to design, double hung windows are nearly identical to single hung windows. Due to their similar look, choosing double hung windows over single hung windows comes down to individual preferences, as well as climate. For example, double hung windows are more popular in warm climates where more ventilation is desired.