Good Simple Window
Single hungs are good simple windows that used to get a bad rap as a builder grade window. However, advances in manufacturing and improvements in energy efficiency requirements have brought about a much better crop of single hungs. Single hungs have less moving parts than double hungs, which does make them less versatile, but also makes for a simpler but still effective window style. They tend to get lumped in with silding windows as the simple but functional residential option.