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To tell if a window is single or double-pane, focus on the edge. Double-pane windows have two glass layers separated by a spacer, which you can usually see around the edges. For single-pane windows, it’s just one sheet of glass. Another easy trick: shine a light at the window—single-pane glass reflects once, while double-pane glass reflects twice. Lastly, if you feel both sides of the glass on a cold day, double-paned windows will feel warmer because of the insulating gap between the panes.

Vinyl window frames are by far the most popular window frames in modern homes. Many favored vinyl frames due to their affordability, durability, energy efficiency, and various colors and styles. Single-pane vinyl windows range from $200 to $900 per window, and double-pane vinyl windows range from $400 to $1,500 per window.

In short, it depends. After 20 years, the glass in your windows is less energy efficient, which can cause increased electricity bills. You might also see signs of water damage or natural wear and tear over the years. However, with proper maintenance, some window frames can last up to 50 years, so you may only need to replace the glass to save on energy. 

At the same time, window replacement is a major investment, so replacing the glass in rooms most impacted by outdoor temperatures is one way to avoid going all-in to replace your windows.

Whether or not it's worth it to install double-hung windows depends on several key factors. First, double-hung windows cost more than single-hung windows, so if you’re looking to lower costs, you might find it more worthwhile to choose single-hung windows. If you want the lowest maintenance requirements, though, double-hung windows are easier to clean.

Double-hung windows also offer better ventilation, making them a good option for bathrooms and kitchens. Single-hung windows have better energy efficiency than double-hung windows because they have only one moving part.