You can use a single hung window anywhere you could install a double hung window, however you may opt to choose single hung windows if you are looking at a whole home window replacement and your budget is a concern. The cost of installing a single hung window is lower than many other window styles, including double hung windows. When you calculate the saving over 15 – 20 windows, it works out to be a significant sum. They are also more energy efficient than double hung windows, helping you save on energy expenses all year long.