Casement windows seal tighter and ventilate better. Double-hung cost less and fit more situations. In vinyl, casement runs $400–$1,000 installed and double-hung lands at $300–$700; wood frames run roughly 1.5–2× higher. But price alone doesn’t drive this decision. The question that matters most: does the window need to open on a wall where something is directly outside?
Casement sashes swing outward on hinges. On a wall facing a walkway or deck, an open casement blocks the path. Above a porch roof or in a narrow side yard with less than 24 inches of clearance, the sash can’t fully open at all. This physical constraint eliminates casement from more installations than energy ratings or price ever do.
How They Operate
Double-hung windows have two sashes that slide vertically in tracks. Both the upper and lower sash move, which allows two airflow strategies: open the bottom for intake, or crack both top and bottom to create a convection loop where warm air exits high while cooler air enters low. Most modern double-hung sashes tilt inward for cleaning, a feature that matters on second-floor bedrooms and anywhere you can’t reach the exterior glass from a ladder.
Casement windows hinge at the side and crank outward using a handle mechanism. The entire sash opens like a door, providing 100% of the window area as ventilation. Double-hung windows max out at 50% because only one sash can occupy the track at a time. For kitchens, bathrooms, and basement egress, that full-opening airflow is a real advantage.
The crank adds mechanical complexity. A double-hung has balance springs (two per sash) that counterweight the glass. They’re cheap and rarely fail within the first 15 years.
Casement operators are gear-driven mechanisms with moving parts that wear. Replacing a failed crank operator costs $75–$150 for the part alone; a window contractor charges another $75–$125 for the service call. Plan for at least one crank replacement over a 25-year window lifespan.
Casement windows with multi-point locks engage the sash at two or three points along the frame — harder to pry open than a standard double-hung latch. For ground-floor windows accessible from outside, that added resistance is a real advantage.
Air Sealing and Energy Performance
This is where casement pulls ahead on paper and in blower-door tests. The crank mechanism pulls the sash tight against the frame, creating a compression seal on all four sides. Under AAMA/NFRC standards , casement air leakage is rated at 0.10 CFM per square foot. Double-hung sashes slide against weatherstripping, which allows more infiltration: 0.30 CFM per square foot under the same standard.
That’s a 3x difference in air leakage at the window itself. On whole-house energy bills, the effect is smaller than you’d expect. Windows typically account for 25–30% of a home’s heat loss, and air leakage through the window unit is only one component alongside conduction through the glass and frame. In a 10-window home, switching all windows from double-hung to casement might save 1–2% on annual heating and cooling.
Where the air seal advantage does show up clearly is comfort. In a windy location, casement windows stay draft-free at wind speeds that push air past double-hung weatherstripping. If your home faces prevailing winter winds and you’ve noticed drafts around closed windows, casement eliminates that problem mechanically.
The glazing matters more than the operating style . A double-hung with low-E argon-filled double pane (U-factor 0.25–0.30) outperforms a casement with basic clear glass by a wide margin. Choose your glass package first, then pick the operating style that fits the opening.
Side-by-Side Comparison
| Feature | Casement | Double Hung |
|---|---|---|
| Installed cost | $400–$1,500 (vinyl–wood) | $300–$1,200 (vinyl–wood) |
| Air leakage (AAMA) | 0.10 CFM/sq ft | 0.30 CFM/sq ft |
| Ventilation area | 100% of opening | ~50% of opening |
| Cleaning access | Exterior reach required | Tilt-in from inside |
| Window AC compatible | No | Yes |
| Screen type | Interior, fixed | Exterior, half or full |
| Egress compliance | Easily meets most codes | Requires minimum sash size |
| Hardware repair cost | $150–$275 (crank operator + labor) | $15–$30 (balance spring pair) |
| Protrudes when open | Yes, 6–10 inches | No |
Where Each Type Works Best
Not every room calls for the same window. Mixing casement and double-hung in the same house is common, and it’s often the smartest approach.
Use casement for:
- Kitchen windows above the sink, where the crank handle is easier to reach than lifting a sash
- Bathrooms, where maximum ventilation clears moisture fast
- Basement egress windows , where the full-opening sash meets code requirements without oversizing the unit
- Any wall with open yard beyond it and no foot traffic below
Use double-hung for:
- Second- and third-floor bedrooms, where tilt-in sashes let you clean from inside
- Walls facing walkways, decks, patios, or porches where a projecting sash creates a hazard
- Rooms where you might install a window AC unit
- Narrow side yards where exterior clearance is under 24 inches
- Front-facing windows in traditional-style homes, where double-hung proportions match the architecture
One detail that gets overlooked: screens. Casement windows use interior-mounted screens because the sash swings out. You see the screen from inside the room at all times, which affects the view.
Double-hung screens mount on the exterior and are barely visible from the living space. In rooms where the view matters — overlooking a garden or a wooded yard — that difference is real.
Another thing contractors see regularly: homeowners who install casement windows above a kitchen sink and later realize they can’t open the window without moving everything off the sill. The crank handle sits at the bottom of the frame, and you need to lean across the counter to turn it. That’s still easier than lifting a double-hung sash from arm’s length, but the sill clearance issue catches people off guard.
Cost Breakdown
The $100–$300 price gap between casement and double-hung narrows or widens depending on frame material and size. Here’s how the numbers break down for standard sizes:
| Configuration | Double Hung | Casement |
|---|---|---|
| Vinyl, standard (30×48) | $300–$550 | $400–$700 |
| Vinyl, large (36×60) | $450–$700 | $550–$900 |
| Fiberglass, standard | $500–$900 | $600–$1,000 |
| Wood, standard | $700–$1,200 | $850–$1,500 |
For a 10-window project in vinyl, the casement premium adds roughly $1,000–$2,000 to the total compared to double-hung. That’s a real number but not a dealbreaker if casement suits your openings. Full pricing details are in the window replacement cost guide .
Longevity and Maintenance
Both types last 20–30 years in vinyl frames, longer in fiberglass or wood. The signs you need new windows covers the specific failure indicators that tell you a window has reached end of life regardless of type. The maintenance profiles differ.
Double-hung windows need weatherstripping replacement every 8–12 years as the sliding seals compress. Peel off the old strip, press on the new one — a 10-minute job per window. Parts cost $10–$20 per window.
Beyond that, vinyl double-hung windows need almost nothing. The tilt-in mechanism has a simple pin-and-cam design that rarely fails.
Casement windows need occasional lubrication of the crank mechanism, ideally once a year with silicone-based lubricant. Skip that maintenance and the operator stiffens until it eventually strips its gears. The hinges also accumulate debris in the track over time, especially on windows that stay open frequently. A failed operator is the most common casement repair, and you’ll recognize it coming: the crank gets progressively harder to turn for a year or two before it stops working entirely.
Making the Decision
Start with your walls, not your preferences. Walk around the house and note what’s directly outside each window opening. Any wall facing a walkway, deck, porch, or narrow side yard eliminates casement for that location. What’s left is where casement’s superior ventilation and air seal add value.
For most replacement projects, the answer is a mix: casement in kitchens and bathrooms where ventilation matters, double-hung everywhere else. That combination keeps cost down while putting the better-performing window where it earns its premium. Once you know which types you need, the window replacement process guide walks through what happens on installation day.
If you’re comparing both types across different frame materials and glass packages, the window comparison guide covers the full range of options side by side.