Casement vs. Double-Hung Windows
Two of the most popular residential window styles — casement and double-hung — each have clear advantages depending on the application. Here's how they compare.
At a Glance
| Feature | Casement | Double-Hung | |---------|----------|-------------| | Operation | Crank-out, hinged on side | Both sashes slide up and down | | Ventilation | Full opening | ~50% of frame area | | Energy efficiency | Excellent (compression seal) | Good | | Cleaning ease | Easy (sash swings out) | Easy (sashes tilt in) | | Cost | $250–$700 per unit | $200–$600 per unit | | Best for | Views, airflow, modern homes | Traditional homes, multi-story |
How They Operate
Casement windows open outward on a side hinge, operated by a crank or lever at the bottom of the frame. The sash swings out like a door, providing a clear, unobstructed opening.
Double-hung windows have two sashes that slide vertically within the frame. The upper sash can be lowered and the lower sash raised, creating flexible ventilation options.
Ventilation Performance
Casement windows are superior ventilators. Because the sash opens fully, they can channel wind into a room — useful in areas with prevailing breezes. They're often placed where airflow is a priority.
Double-hung windows offer split ventilation: warm air can escape from the top while cool air enters from the bottom. This convection-based cooling works well in climates with hot summers.
Energy Efficiency
Casement windows generally outperform double-hung on air infiltration. When closed, the sash presses against the frame under wind pressure (compression seal), similar to a refrigerator door. Double-hung windows have sliding seals that are more prone to minor air leakage over time.
Aesthetic Fit
Casement windows suit contemporary, craftsman, and farmhouse architectural styles. Their clean horizontal lines and uninterrupted glass area work well in modern homes.
Double-hung windows are traditional and blend naturally with colonial, cape cod, and Victorian architecture. They're the default window type for most replacement projects.
When to Choose Casement
- You want maximum ventilation from a single window
- The home has a contemporary or craftsman aesthetic
- Energy performance is a top priority
- The location is accessible for crank operation (avoid casements over counters or in tight spaces)
When to Choose Double-Hung
- Matching existing windows on a traditional home
- The window is above a counter, porch railing, or walkway where outward swing is impractical
- Replacing windows in a multi-story building where exterior cleaning access is limited
- Budget is a primary constraint
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