Casement windows and sliding windows both have their advantages and disadvantages, but when it comes to energy efficiency, casement windows are generally considered to be more efficient than sliding windows.

Here are a few reasons why:

Sealing: Casement windows have a tighter seal than sliding windows. When closed, the sash on a casement window presses against the frame, creating a tight seal that helps prevent air leakage. Sliding windows, on the other hand, have a looser seal that allows more air to leak in and out.

Airflow: Casement windows open outward, which allows for more control over the amount and direction of airflow. This means that you can direct fresh air into your home while blocking out unwanted drafts. Sliding windows, on the other hand, only allow for half of the window to be open at a time, limiting the amount of airflow.

Insulation: Casement windows are typically made with thicker glass than sliding windows, which provides better insulation. This can help keep your home warmer in the winter and cooler in the summer, which can lead to energy savings on your heating and cooling bills.

Security: Casement windows are more secure than sliding windows because they have a hook-shaped lock that is embedded in the frame. This makes it much harder for intruders to pry the window open from the outside.

Of course, the specific energy efficiency of a window will depend on a variety of factors, including the materials used, the quality of the installation, and the climate where you live. But in general, casement windows are a good choice if energy efficiency is a top priority for you.

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