Favored for letting in plenty of natural light, sliding windows also have something else on their side: gravity. Unlike double-hung windows, which require the user to pull them up, sliding windows require less force since they don’t need to be pulled up or down. Instead, they slide horizontally back and forth, making them easier to open and close as they do not require much effort. These windows are also ideal for porches, decks, and patios, as they do not slide outward. The less work, the better!.