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When to Use Casement Windows

Casement windows aren’t often on top of homeowner’s minds but can be great choices in a variety of situations. A casement window is characterized by its door-like operation. Attached to side-mounted windows, it is opened and closed by rotating a crank; a tensioner holds the sash in place when the window is in the open position. When closed, the sash is held tight against the window frame’s weather-stripping by a latch.


Casement windows are the only consumer windows to fully open. On the other hand, all other windows installed in homes open halfway at most. If you’re wondering about the best places to use casement windows, here is a look at when they’re commonly installed:

To Improve Air Flow

A great way to catch a breeze, a casement window can funnel breezes into your home. It is especially effective at catching breezes at an angle when homes are very close to their neighbors. However, breezes flowing over the top of the sashes won’t likely get inside, so this benefit depends on the direction of the window and the motion of the prevailing wind.

When You Want a Clear View

If you want an unobstructed view, with the option to open the window, a casement window is the way to go. It’s the only type of window that offers this. However, dual sash casement windows feature a functional vertical divider. Otherwise, there are no vertical or horizontal strips dividing the sashes, so you can enjoy that scenic view of the beach, lake, mountains, or whatever backdrop can be appreciated from your living room.

When Security Is a Concern

Casement windows are harder to break into than other windows. While an intruder can break the glass of a double-hung window and reach for the latch to open the sash, casement windows can only be opened by turning the window crank inside (unless you have a push-open window). Even through broken glass it is hard to turn the crank. If you’re extra concerned about security, you can remove the crank and store it nearby but out of reach to anyone outside.

Casement Windows Aren’t Always the Best Choice

There are times when using casement windows isn’t the best idea. For example, installing a casement next to another can cause open sashes to conflict with one another. Also, most types of window A/C units won’t fit in a casement window. The sashes don’t open far enough for a window unit to fit. Casement/slider A/C units are available but cost several times more than standard window units.

Insect screens must be placed on the inside of the window because the sashes open outward. If you have children, casement windows may not be suitable as the screens are easier to reach and tamper with. Another issue arises in places where there is a lot of sunlight. The angle of an open sash can reflect sun directly into your home. Unless the room is normally very dark, this can shine blinding light into the house. In addition, open sashes are vulnerable to breaking, while exposure to the elements including run, rain, and snow can cause the seals and frame to become weather beaten.

Let Window World of Boston Help You Make the Right Pick

Our friendly, knowledgeable staff can answer all your questions and provide a free in-home consultation and estimate. Financing is available through the Window World Credit Card Program or you can apply for a home improvement loan. For more information, contact our Pembroke or Woburn offices today.

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