What Are The Advantages Of Casement Windows Over Slider Windows?

Casement and sliding windows are stunning and offer various cutting-edge functionalities. But when there are many designs under crank and slider styles to choose from, each with its own set of benefits and drawbacks, how do you choose the perfect one?

Energy efficiency and practicality are justifiably the top priorities of any homeowner. These two factors are inextricably linked to the type of modern windows you select, which is why it’s critical to understand the fundamentals of how these two window styles work. But the first part is distinguishing between the two primary types of windows – casement vs. sliding. 

Let’s find out! 

Casement Windows

Casement window open and close with a crank. You have to turn the crank handle to swing open the windows outward. Another feature of the casement, aside from the iconic crack style, is their one or more side hinges that connect the window to the frame.

Casement designs can include double French casement windows, in-swing casement windows, push-out French casement windows, etc. Awnings are similar to casement window style, using a crank mechanism to open and close. But instead of side hinges, they have a top hinge.

They work well in spaces where the width is greater than the height. The crank compression of casements locks out undesirable air from the outside, making them the most energy-efficient. 

Casement Windows vs. Sliding Windows

Comparing Energy Efficiency 

The flexible seal to facilitate smooth top and bottom runners prevents it from having strong airtight sealing as casements. This makes sliding windows are less energy-efficient than casement windows. The little gaps between the top and bottom sashes permit air to get through. Meanwhile, a casement window sash seals snugly against the frame when shut and secured, leaving no pathway for air to travel.

Is It Better To Install A Casement Window Or Sliding Windows?

Here are some pros and cons to help you weigh the benefits and drawbacks of your options. 

Casement Windows Advantages: 

  • Casements open entirely, allowing for ample airflow.
  • The window sashes pull the cross breezes into the home, enhancing the ventilation system. 
  • The excellent compression seal technique makes it the most energy-efficient of all windows.
  • Perfect for difficult-to-reach areas. 
  • Allows an unrestricted view.
  • It is convenient to clean— can be cleaned from the inside of the house. 
  • Sturdy and tough to break in— high level of security. 
  • Maximum lighting and access to unobstructed vistas


  • An improper crank operation can ruin the mechanism.
  • The windows open outward— but this is fixable. You can customize it to get casements that open both inward and outward. 

Sliding Window Advantages:

  • Offers large openings.
  • Customizable to 90-degree tilting for effortless cleaning. 
  • Does not consume any external space for opening. 
  • Cost-effective


Absence of compression seal.

Weaker energy efficiency as compared to crank-operated windows. 

Weaker air and watertight properties as compared to crank-operated windows. 

Frictions and dirt accumulation can hamper operability. 

The appearance can seem inconsistent given the half-screen on only one side of the window. 


Casement windows and sliding windows are both stunning modern innovations that instantly beautify a house. We have discussed the advantages and weaknesses of both window styles, now it’s up to you to decide which style best suits your taste and home. 

In the end, it all boils down to design, functionality, and of course, personal preference. So, make it a point to partner with only qualified window manufacturers and suppliers to get the most out of your new windows. TOSTEM India can assist you in customizing the window of your choice for the highest energy-efficient solutions possible.

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