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The average lifespan for a casement window is around 20 years, but some higher-end casement windows with more durable frame materials can last up to around 40 years before you need to replace them. You’ll need to carry out routine maintenance and window cleaning—and, on occasion, casement window restoration—to extend the lifespan of your casement windows. But they tend to wear more slowly than windows with sliding sashes because the weatherstripping sees minimal friction.

Soundproof windows can be energy efficient, depending on the window type and manufacturer. Overall, triple-pane windows are more energy efficient than double-pane windows. However, according to the U.S. Department of Energy, a window’s energy-efficiency level is determined by multiple factors, including the frame material, if there’s any low-emissivity (low-E) glass, and the addition of spacers.

No, not every window has movable sashes. Many fixed or stationary windows that were intended only to provide views and sunlight still have inoperable sashes that allow them to match the rest of the windows in a home. These are called sash-set fixed windows. They are created by glazing a window into a sash that is secured to a frame.

Garden windows last about 15 to 30 years, depending on the materials, ongoing maintenance, and local climate. Fiberglass and wood windows tend to have the longest life spans as long as you keep up with cleaning, lubricating, and refinishing them. Make sure to inspect your windows about once a year for signs of trouble, like worn-out seals, frame damage, or cracks in the panes.