Ah, the jalousie window. The name might sound elegant, but the function and reputation tell a different story.

A jalousie window, also known as a glass louvered window, is made up of horizontal slats — typically glass, metal, or wood — set into a track and operated by a crank. Think of it like a cross between a window and a Venetian blind. While they once had their moment, there are several reasons why most homeowners are looking to replace these outdated styles today.

What Is a Jalousie Window?

Jalousie windows are made of horizontal panels that open outward using a crank mechanism. They're sometimes referred to as louver windows, designed to maximize airflow while offering partial shelter from rain or sun.

Common in tropical climates and older sunrooms, these windows are often mistaken for modern ventilation systems. However, their outdated design presents several drawbacks in today’s homes.

The History of Jalousie Windows

Jalousie windows were patented in 1901 but didn’t gain popularity until the 1940s–1960s. They became common in southern homes that lacked air conditioning, prized for their ability to catch a breeze and ventilate the home naturally.

In northern states and the Midwest, windows appeared in porches, sunrooms, and mobile homes, where space-saving and airflow were valued.

Why Jalousie Windows Fell Out of Favor

By the 1970s, air conditioning became the norm, and the energy crisis made homeowners rethink drafty, inefficient windows. The appeal of jalousie windows declined rapidly — and for good reason.

Rust Issues

Jalousie windows are exposed to outdoor moisture, which corrodes metal components and causes rust to form on tracks and cranks. Over time, rust can damage the window frame and impair function.

Security Risks

Security is a major weakness of jalousie windows. The slats are easy to remove or break, making them a poor choice for homes that prioritize safety. Even reinforced materials don't solve the core security flaw in the design.

Poor Insulation and Energy Efficiency

These windows never fully seal, allowing air to leak in or out. That means higher energy bills when running heating or air conditioning. Even modern jalousie windows with improved sealing still underperform compared to standard double-pane or triple-pane windows.

Too Many Moving Parts

Jalousie windows use cranks, levers, and gears to open and close. More components mean more chances for things to break. If you’re constantly fixing jalousie windows, you may want to consider a full replacement instead of ongoing maintenance.

Pest Entry Points

Insects and pests can enter your home through the gaps between louvers. Unlike sealed windows, window designs make it easier for bugs and debris to slip through.

Jalousie vs. Louvered Windows

Not all louver-style windows are created equal. Some louvered designs are purely decorative or have tighter sealing mechanisms. Traditional jalousie windows still lag behind in energy efficiency and security. If you're comparing jalousie and louvered windows, know that most modern options far surpass their older counterparts in performance.

Jalousie Window Costs and Installation

A basic jalousie window costs between $180 and $375, not including labor. Installation adds another $150 – $300 per window depending on accessibility. While that might seem affordable, the long-term costs — due to poor insulation and frequent repairs — can quickly outweigh the initial savings.

In the end, many homeowners find themselves paying more to replace them with better alternatives.

Why Jalousie Windows Aren’t Right for Your Home

Modern windows should be energy-efficient, secure, and low-maintenance. Jalousie windows check none of those boxes. They’re drafty, outdated, and demand frequent attention.

If your home still has jalousie windows, now is the time to upgrade your window frames. Alternatives like casement, sliding, and double-hung windows offer airflow without the downsides.

Your windows should enhance your comfort — not work against it. Talk to a Feldco product specialist and explore your replacement options today. Get a free quote online and discover modern, energy-efficient solutions designed to improve your home.