The most commonly used window in the USA today is a double hung window. Double hungs get their name from the double set of sashes that traditionally were hung from counter weights inside the window frame. The counter weights allowed the sashes to be lifted or raised with less effort. They also allowed the sash to stay in position while raised.
Today, double hung windows rarely use counter weights. Instead, either spring balances or steel coils are used to balance the weight of the sash as it is raised and lowered.
SoftLite’s double hung windows offer many innovative features: