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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.

The average mirror has a lifespan of 10 to 15 years. After that, the coating begins to deteriorate, losing its reflective properties. Acrylic mirrors have a slightly shorter lifespan of seven to 10 years. Higher-quality acrylic sheets with UV-resistant properties have lifespans similar to those of your average mirror. By maintaining your mirrors and keeping them out of direct sunlight when not in use, you can extend their lifespan. Some mirrors can last for decades.

Whether it's better to repair or replace a broken mirror depends on its size, value, and the extent of the damage. For small, inexpensive mirrors, replacement is often the better choice, as the average repair cost of around $200 can be close to the price of a new one. However, for large mirrors—like those over a bathroom vanity or large floor mirrors—repair is usually more cost-effective. A new large mirror can cost hundreds or even thousands of dollars, while repairs typically range from $50 to $200. You should also consider the mirror's age and sentimental value. Antique mirrors and family heirlooms are often priceless and irreplaceable, making repair the most sensible or only option.

The best (and safest) glass for glass walls is tempered and laminated glass. These types of glasses work well for walls because they are durable against impact and heat.