Premium Vinyl Double-Hung Window Double-hung windows are best suited to traditional architectural styles. They feature an upper and lower sash that slide vertically past each other in a single frame. Both sashes tilt in for convenient cleaning.Premium Vinyl Casement Window The simplicity of design is always on display with a casement window. This operating type of window provides maximum ventilation and allows the sash to be opened outward to the left or right.Premium Vinyl Single-Hung Window These windows are best suited to traditional architectural styles. Single-hung windows feature a bottom sash that lifts vertically towards a fixed top sash and tilts in for easy cleaning and maintenance.