Air leaks around windows can be caused by a variety of factors, including:

Poor installation: If a window is not installed properly, there may be gaps or spaces that allow air to leak through. This is particularly common in older homes or in DIY window replacement projects.

Aging or damaged weather-stripping: Over time, the weather-stripping around windows can become worn out, cracked, or damaged, which can allow air to leak through.

Cracks or gaps in the window frame: If there are cracks or gaps in the window frame itself, air can enter or escape through these openings.

Single-pane windows: Single-pane windows are less energy-efficient than double-pane windows, and they may allow more air to leak through.

Poor-quality or damaged window glass: If the glass in a window is poor quality or damaged, it may allow air to leak through.

Extreme weather conditions: During extreme weather conditions, such as high winds or heavy rain, air leaks around windows may become more apparent.

To prevent air leaks around windows, it is important to ensure proper installation, regularly check and maintain weather-stripping, and consider replacing old, single-pane windows with more energy-efficient options.

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