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Glass block windows are energy-efficient because they are much thicker than traditional glass panes, making them better insulators. They are sealed airtight, which prevents drafts and stops warm or cool air from escaping, helping to save money on heating and cooling bills. Unlike traditional windows that can be opened and closed, sealed glass block windows eliminate the potential for air leaks. For proven efficiency, look for options that are Energy Star rated. The cost for energy-efficient glass block windows is typically around $400 per window, which may be higher than standard windows.

There are several ways to reduce noise coming through your windows. You can seal gaps around the window frames with acoustic caulk or fresh weatherstripping to reduce noise and air leaks. Installing sound-dampening curtains, thick blinds, or shades can also help deaden sound vibrations. For an additional interior barrier, consider installing an acrylic or plexiglass sheet inside the window, which stifles sound while still allowing for outdoor views. Another strategy is to add external barriers, like dense shrubbery or a sturdy fence, to block neighborhood noises. If these methods are not effective enough, it might be time to install new noise-canceling windows.

The biggest disadvantages of low-E windows have to do with cost and, depending on your personal taste, appearance. Low-E windows cost more than traditional windows—typically between $300 and $1,000 per window, plus installation costs. Though they can save you money in the long run, low-E windows have a hefty upfront price tag. Additionally, low-E windows have a slightly different look than traditional windows. While some people don’t notice it, others say the low-E coating gives windows a hazy look.

It is legal to put bars on windows in most places, but it depends on the type of bars you choose and the regulations in your area. For example, there are building codes in Mississippi, California, and Texas that forbid the use of permanently closed burglar bars on windows due to concerns about people getting trapped inside during fires.