Double-hung windows are the most popular style manufactured by Soft-Lite ‒ and, in fact, are the most-used window throughout the country. A double-hung is the classic residential window, composed of a set of vertical sashes that both slide up and down. What is immediately apparent about a Soft-Lite double-hung window is its stylish beauty. What might not be so easy to see – until you get your next power bill – is how energy efficient Soft-Lite double-hung windows are. In fact, Soft-Lite’s double-hung designs are the most energy efficient in the industry, as well as the highest-performing.