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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.

Replacing window glass instead of the entire window is more cost-effective, maintains the frame's aesthetics, and reduces waste. It improves insulation and energy efficiency and can be completed more quickly with minimal disruption to the home.

Most manufacturers have their name imprinted somewhere on the window, such as the spacer bar, hardware, or frame. Other manufacturers will include an identification number printed on the glass itself. If you’re unable to find either of these, then your window was manufactured locally (oftentimes called a “shop window”). 

With a manufacturer name (or even better, the identification number) you can attempt to research the information to find out when the product was made. Keep in mind this won’t tell you when the window was installed on your home, but can get you close.

If you don't have hurricane shutters or impact-resistant windows, boarding up windows before a hurricane is worth it. According to the Federal Alliance for Safe Homes, protection is essential for all your home's entry points, including windows, doors, skylights, and garage doors.  

When windows break, wind enters your home, creating enough pressure that could cause the weakest part of your to rupture. Often, the weakest part is the roof, which can "pop" off of a home in a hurricane. The simple act of boarding up your windows can protect the structural integrity of your house.