What’s the difference between a double-hung and a casement window? Though both double-hung and casement windows are generally tall and rectangular, casement windows swing open on side-mounted hinges, while double-hung sashes move up and down within the frame. The choice between double-hung and casement often comes down to location. Areas that are hard to reach, such as over a kitchen window, may benefit from a casement that opens easily with a crank instead of trying to lift the sash from a distance. However, casements may not be ideal if there’s an obstruction near the window, such as a tree or air conditioning equipment that the casement could swing into. In those cases, double-hungs are your best bed. Sometimes casements and double-hungs pair nicely together. Consider a beautiful window wall with a double-hung in the center and swing-out casements on either side!