What are the most common sliding window sizes?

Sliding windows are available in 36, 48, 60, 72 and 84 inches wide and 24, 36, 48 and 60 inches high. Before purchasing windows, it's essential to be aware of the installation size requirements.

What is the most efficient type of window glass?

There are many types of glass suitable for windows, but low emissivity (Low-E) glass is the most energy-efficient. The glass has an invisible coating that let's heat and light in and limits the amount of heat that can escape.

What is the most energy-efficient window treatment?

The most energy-efficient window treatments are cellular shades. They work to keep rooms warm in the winter and cool in the summer via cell pockets that work to trap air around the window. Cellular shades can be mounted inside the window frame our outside; however, outside mounting can be more efficient. They can be purchased in a variety of colors, patterns, and insulating levels. Screens and sliding panel track blinds are other popular options. While they can help to reduce potential window energy loss, they are not an overly efficient option.

Can you replace broken window glass?

Over time, the glass may break, or the seal may separate. This allows air and moisture, which can reduce the windows energy efficiency and lead to the glass fogging. While some may opt for a do-it-yourself replacement, we suggest leaving this repair to the professionals to prevent potential window leaks that could limit the efficiency of the window. If the windows are old and not Energy Star rated, it's an excellent time to consider a full window replacement. The cost of replacing the entire window will pay off over time.

Will portable air conditioners work with sliding windows?

If you plan to purchase an air conditioner for use with your sliding window, look for units that are compatible with your window type. Most portable air conditioners include fasteners and inserts for installation with sliding and casement windows.

In-Depth Product Guide

Sliding Window

FAQs

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Also called a sash window, sliding windows can be opened by sliding a moveable 'sash' horizontally or vertically within the frame. A single hung window has one moveable sash, while double hung windows can open each sash.

Sliding windows can cover large openings, but they are not as energy-efficient. Consider substituting a casement or tilt-and-turn window for the opening part, and a fixed window for the rest of a large area, so you have both fresh air access and the big view.

Look for the Energy Star window rating label in North America. It contains these factors for windows:

U-value (inverse of R-value) measures how fast heat flows through, so lower U-value is better)
Solar Heat Gain Coefficient (SHGC) measures how well the window transfers solar heat energy
Air leakage (lower is better), and Energy Rating (ER - dimensionless) is a combination of all those factors (higher ER is better)

Excellent U-values are around 1 W per sq. m per degree (equivalent to R5), and excellent ER ratings are above 35.

Sliding windows have a higher tendency to leak air, so are typically not as energy efficient as casement windows. When the weather stripping gets damaged, they are also more prone to leaking in water.

The most basic window is, of course, merely a hole in the wall to let in light and air. Different materials have been used over time to fill window openings to let in light while keeping out insects, animals, rain, and wind. Before glass became widely manufactured, translucent materials including paper, animal hides, flattened animal horn, and even thin slices of marble were used as window panes.

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