Windows provide our homes with light, warmth, and ventilation, but they can also negatively impact a home's energy efficiency. You can reduce energy costs by installing energy-efficient windows in your home. Some energy efficiency improvements to existing windows can also help.

Window Operating Types

When selecting windows for your home, it's also important to consider how they're operated. Some operating types have lower air leakage rates than others, which will improve your home's energy efficiency.

There are numerous window operating types to consider. Traditional types include the following:

• Awning

  Hinged at the top and open outward. Because the sash closes by pressing against the frame, they generally have lower air leakage rates than sliding windows.

• Casement

  Hinged at the sides. Like awning windows, they generally have lower air leakage rates than sliding windows because the sash closes by pressing against the frame.

• Fixed

  Fixed panes that don't open. They're airtight but not suitable in places where window ventilation is desired.

• Hopper

  Hinged at the bottom and open inward. Like both awning and casement, they generally have lower air leakage rates because the sash closes by pressing against the frame.

• Single- and double-hung

  Both sashes slide vertically in a double-hung window. Only the bottom sash slides upward in a single-hung window. These sliding windows generally have higher air leakage rates than projecting or hinged windows.

• Single- and double-sliding

  Both sashes slide horizontally in a double-sliding window. Only one sash slides in a single-sliding window. Like single- and double-hung windows, they generally have higher air leakage rates than projecting or hinged windows.

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Window Installation
Even the most energy-efficient window must be properly installed to ensure that its energy performance is achieved and that it does not contribute to a home's moisture problems. Therefore, it's best to have a professional install your windows.
Window installation varies depending on the types of the following materials:
• Window
• House construction (wood versus masonry)
• Exterior cladding (e.g., wood siding, stucco, brick)
• Weather-resistive barrier.
Windows should be installed following manufacturing recommendations, along with the following additional guidelines (primarily for windows with fin mounting systems).

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