What Are Jalousie Windows? (2025)
All products and services featured are independently selected by our editors. However, when you buy something through our retail links, we may earn an affiliate commission.
You may not know what jalousie windows are, but you’ve likely seen them. These windows have horizontal slats and can most often be found on coastal homes, since they let in a breeze while keeping rain out. Though these windows have decreased in popularity since the 1970s, you can still install new jalousie windows or get jalousie window replacement. Here’s what you need to know.
Get Estimates From Local Window Experts
Just answer a few questions, and we'll take care of the rest.
What Are Jalousie Windows?
Jalousie windows have horizontal slats most often made of wood, plastic, glass, or aluminum. The slats resemble Venetian blinds and are typically four or six inches deep depending on the size of the window. These windows were commonly used on homes in warmer climates between 1900 and 1970 to allow in air. They lost purpose once air conditioning became popular, and many manufacturers stopped making them by the 1990s.
Jalousie Windows Functionality
Also called louvered windows, jalousie windows are designed with a hand crank or knob that raises the slats outward. They can be opened so that the slats are parallel to the ground or at an angle tilted downward or upward. This allows air in while preventing rain from getting inside and maintaining some privacy.
Jalousie Window Styles
There isn’t much variety when choosing jalousie windows. You can choose between slat depths of four or six inches. Slats can be nearly any length. You can also choose a hand crank or automated programming to open and close the slats using a remote.
The biggest choice when purchasing jalousie windows is the type of glass. You can select from frosted, textured, UV-protected, or tempered glass. Tempered glass is strongest and most resistant to breaks, so it’s best for security.
Jalousie Window Installation
While you can find many sites that explain how to install a jalousie window yourself, we don’t recommend this. These windows have issues with sealing due to their design, and the project is more involved than you might think. It requires either removing an existing window and framing or cutting a hole in your wall if there isn’t already an opening. Then, you’ll have to measure and install flashing, caulk the window frame and trim, cut shims, and possibly redo plaster and paint. It’s not a quick do-it-yourself (DIY) project. Hire a licensed contractor for the best results.
Jalousie Window Cost
Many home improvement stores carry jalousie windows ranging from $100 to $250. The price varies by size and material. Windows with glass slats are the most expensive, and wooden slats are close behind. Opting for treated glass will increase the price, as will adding an automated controller. Several of today’s best window brands produce jalousie windows, so choose a well-vetted company for more efficient and long-lasting windows.
A qualified contractor can provide a quote for window installation costs in your area. You can reduce costs by waiting to install in cooler months or replacing an existing window rather than installing a new window where there isn’t an opening.
Should You Install Jalousie Windows in Your Home?
Consider the following before installing jalousie windows.
Pros of Jalousie Windows
- Natural ventilation: You can get a great cross-breeze if you have jalousie windows at opposite ends of your home or room.
- Customization: You can easily switch out slats as your style preferences change.
- Easy to use: Jalousie windows are low maintenance and easy to open and adjust.
Cons of Jalousie Windows
- Lack of security: The slatted design makes them easy to break, and it’s not difficult for someone to reach through or even remove the slats from the outside.
- Energy inefficiency: Because jalousie windows don’t have a tight seal, cold air will leave your house in summer and enter your house in winter. This poor energy efficiency can increase your electric bill.
- Inaccessibility: Though there are retailers that carry jalousie windows, they’re not as easy to find or replace as many other window types.
Our Recommendation
We don’t recommend that homeowners install jalousie windows because they have poor sealing and pose a security risk. If you’re set on installing one or several throughout your home, hire a licensed contractor to do the job to maximize efficiency. Ask your contractor to winterize the windows for added temperature control if you live in a cold climate.
Get Estimates From Local Window Experts
Just answer a few questions, and we'll take care of the rest.
Jalousie Windows FAQ
What was the purpose of jalousie windows?
Jalousie windows were commonly used in homes in the 1900s for increased airflow in warmer months. You could open windows facing opposition one another for a cooling breeze.
What is the difference between a louvre window and jalousie?
There is no difference between a louvred window and jalousie window. They’re different names for the same type of window.
Where are jalousie windows used?
Jalousie windows are most often used in warm climates to let in air on hot days. While they’re not used much anymore in modern houses due to central air conditioning, many coastal homes still have them. You may also see them on enclosed porches or sunrooms.
What is the difference between jalousie and casement windows?
Jalousie windows have slats that open horizontally, whereas casement windows have a single glass pane that opens outward from one side. Casement windows are much more secure than jalouse windows and easier to seal, making them more energy efficient as well.