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A comparison of Casement vs Sliding and Casement vs Awning Window


December 20, 2022

Casement Window vs Sliding Window


Sliding windows are used in openings that are wider than they are tall. One pane slides over the other as they open in an oblique fashion. They are made to maintain a comfortable interior temperature all year. They are only appropriate for interior spaces.

Casement windows, which are also called crank windows, are often put in windows with tall, narrow openings. As they swing outward, the windows are fastened to the side of the window frame. Casement windows are opened and closed with a crank, handle, or lever. They are intended to permit unrestricted airflow. They are appropriate for all kinds of weather. Moreover, cleaning them is simple.


Depending on how each type of window is constructed, air flows through the openings differently. Most casement windows fully open to allow air to flow through the opening. Ventilating rooms is easy with casements. In the summer, they are perfect for keeping the space cool.

Typical sliding windows don’t provide as much ventilation because half of the window space is covered or closed. Compared to casements, sliding windows require less maintenance.

Energy Efficiency

Sliding and casement replacement windows are both energy-efficient, but there is a distinction between the two choices. A sliding window must be able to be opened, so the seal needs to be somewhat flexible in order for the window to open and close.

Despite being extremely efficient windows, casement windows do not have flexible seals. While both options for replacement windows are energy-efficient, casement windows are more so because they are rigid in nature.

Summary (Pros and Cons of Both) – Casement vs sliding window

Casement Windows


  • offers great ventilation because the entire window can be opened
  • because it seals tightly to the sash, it is extremely energy-efficient
  • gives unhindered views
  • Easily cleaned
  • a greater barrier to entry


  • given that it opens outward, it might obstruct walkways
  • regular upkeep may be required for the crank

Sliding Windows


  • easily cleaned
  • requires no outside space to open
  • a more affordable choice
  • without a crank, less maintenance
  • can be more appropriate for a home’s design as a picture-style sliding window


  • lacking a compression seal makes it less energy-efficient.
  • diminished ventilation, particularly if only half the window is open

Casement Window vs Awning Window


Operation and position of the hinge:

Awning windows open differently from casement windows even though both can be opened with a hand crank. Casement windows frequently open horizontally and have hinges on either the left or right side. Awning windows open vertically because the hinge is located at the top.


Although both awning windows and casement windows are rectangular, their structures differ. Casement windows are typically taller than they are wide, whereas awning windows are typically wider. Casements aren’t made wider than 36″, and an awning window can be made up to 48″.

Compatibility with emergency situations:

To exit a casement window, simply turn the window crank to a 90-degree angle, take off the screen, and climb out. Because of this, they make a great option for egress windows in bedrooms. Because awning windows open at a 45-degree angle and the opening mechanism divides the space in half, they do not provide much open space.


Both awning and casement windows require little maintenance; however, cleaning awning windows is more challenging due to the difficulty of getting to the window’s hinged top portion. Casements are simple to clean because they open completely and slightly to the side, enabling you to reach out to the exterior glass.


Awning windows are more common in kitchens and bathrooms than casement windows because they are better for rooms that need constant or regular air flow. They can also be left open when it rains without exposing the house to water damage.

Energy Efficiency

Awning windows and casement windows are two of the most energy-efficient window types available.

A fixed window, for example, ranks first on the list of the most energy-efficient windows. Awning and casement windows are slightly lower. They only have one sash and form a tight seal around its perimeter. Casement and awning windows are both more energy efficient than other operable types such as sliding windows. The sash fits snugly against the window frame when the windows are closed.

Summary (Pros and Cons of both) – Casement vs awning window

Casement Windows


  • best for taller openings
  • simple to use
  • cleanable from the inside
  • maintain good airflow
  • energy-saving, due to airtight sealing and multipoint locking systems
  • serves as emergency exits
  • great investments


  • may obstruct traffic flow outside
  • crank mechanism may wear

Awning Windows


  • best choice for wider openings
  • simple crank operation
  • provide ventilation in the rain
  • energy-saving, due to airtight sealing and multipoint locking systems


  • when open, the window may protrude into high-traffic areas
  • crank handles need to be maintained
  • cleaning from the inside can be challenging
  • not ideal as emergency exits

How to pick the right window – Casement vs Awning vs Sliding



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