Horizontal sliding windows, a favorite of mid-century design, operate like single or double hung windows but slide horizontally (left and right) instead of vertically (up and down). Replacement slider windows are available in several configurations, including 2- and 3-lite units where two sashes move horizontally. Single slider windows, available with some of our brands, have one sash (right or left) that moves while the other is fixed. Sliding windows work well above the kitchen sink or in any room where ventilation is important. Horizontal sliding windows are perfect by themselves or paired with picture windows.