Picking between double hung and casement windows sounds like a small decision. It isn’t. The style you choose changes how a room breathes, how easy the glass is to clean, whether it passes bedroom safety code, and even how much you pay to heat and cool the space. Same window opening, very different outcomes.
Here’s the short version, then the room by room breakdown.
Quick Answer
Casement windows hinge on the side and swing open with a crank, so the sash presses tight against the frame when shut. That compression seal makes them one of the more airtight, energy efficient styles, and great for scooping side breezes. Double hung windows have two sashes that slide up and down in the same frame. They’re the classic look, easier to fit near walkways and patios, and both sashes tilt in for cleaning.
Neither one wins everywhere. You match the style to what the room actually needs.
Key Takeaways
- Casement = best airflow and tightest seal. Good for kitchens over the sink, bathrooms, and hard to reach spots.
- Double hung = most flexible and low profile. Nothing swings outward, so it fits decks, porches, and rooms near foot traffic.
- Bedrooms and basements need egress. A casement often hits the code opening in a smaller unit because the whole sash opens. A double hung only opens half its height, so it usually has to be bigger to comply.
- Cleaning: double hung tilts in from inside; casement you clean by reaching the swung out glass.
- Cost and look matter too, but airflow, egress, and cleaning access are what usually decide it.
The Head to Head
| Feature | Double Hung | Casement |
|---|---|---|
| How it opens | Two sashes slide up/down | Crank out, side hinged |
| Air seal | Good | Very tight (compression seal) |
| Ventilation | Top and bottom, moderate | Full opening, catches side breezes |
| Cleaning | Both sashes tilt in | Reach the swung out glass |
| Screens | Outside | Inside |
| Egress friendliness | Needs a larger unit | Often complies in a smaller unit |
| Sticks out when open? | No | Yes, the sash swings outward |
| Style vibe | Traditional | Clean, contemporary |
That “sticks out when open” line does more work than people expect. It’s the single fact that rules casement in or out of a lot of rooms.
Room by Room: What Actually Fits Where
Kitchen
Over the sink is the classic casement spot. You crank instead of reaching over faucets and dishes to shove a heavy sash up, and the full opening pulls cooking smells out fast. If the window sits behind a counter you use daily, casement wins on plain convenience.
Where casement gets awkward: if that window opens onto a deck or a walkway where an outward swinging sash would clip people. Then a double hung keeps everything flush.
Bedrooms
This is where code enters the chat. Every bedroom needs an emergency escape and rescue opening. Under the International Residential Code (IRC R310), the window has to give a net clear opening of at least 5.7 square feet (5.0 for a grade floor), with a minimum 24 inch height, 20 inch width, and a sill no higher than 44 inches off the floor.
Here’s the catch most people miss: net clear opening is the actual hole you crawl through, not the glass size or the frame size. A 20 by 24 inch window only gives about 3.3 square feet, nowhere near enough. Because a double hung only opens half its total height, it often has to be a fairly tall unit to clear 5.7 square feet. A casement opens its whole sash, so it frequently hits egress in a smaller footprint. Worth knowing before you fall in love with a look.
Basements
Same egress math as bedrooms if anyone sleeps down there, and space is usually tight. Casement’s smaller compliant size helps. Skip awning style for basement egress, by the way. The opening sash and hardware usually block escape and won’t meet the code opening.
Bathrooms
You want moisture out quick, and you want privacy glass you can still open. Casement’s full opening clears steam fast. It also seals tight when closed, which keeps damp air from leaking. If the bathroom window is somewhere you’d have to lean over a tub to operate it, the crank is a real quality of life upgrade.
Living Rooms and Bedrooms Facing a Porch or Patio
Anywhere people walk right outside the glass, go double hung. No outward swing means no sash in the path and no snagged screens. You still get solid ventilation from opening top and bottom, and the traditional profile tends to suit street facing rooms.
Home Office or Any Second Story Room
Double hung is the easy pick for cleaning. Both sashes tilt inward, so you wash the outside from inside without a ladder. On a second floor, that’s not a small thing.
So Which One Is “Better”?
Honestly, wrong question. Casement is the more airtight, better ventilating style and it makes egress easier, so it earns kitchens, baths, and tight bedroom or basement openings. Double hung is the more flexible, lower profile style that never swings into anyone’s way and cleans from inside, so it earns porch facing rooms, upper floors, and traditional exteriors.
Most homes end up mixing both. That’s normal, and it’s usually the right move.
Whatever style goes in, the glass package is what drives your energy bill: look for ENERGY STAR certified units with a low U-factor and Low-E glass, since a tight seal on a cheap pane still leaks heat. If you’re weighing a full window replacement, that’s the spec to focus on.
FAQ
Are casement windows more energy efficient than double hung?
Generally yes. Casement sashes close with a compression seal against the frame, while double hung sashes slide, which leaves more room for air to sneak through over time. Both can perform well with quality glass, but casement usually has the edge on air tightness.
Do double hung windows meet egress code?
They can, but because only half the window opens, the unit often needs to be taller to reach the 5.7 square foot net clear opening. Always confirm the openable area, not the frame size.
Which is easier to clean?
Double hung, for most people. Both sashes tilt into the room so you can reach the outside glass from indoors. With casement you clean the outside by reaching the swung out sash.
Can I mix both styles in one house?
Absolutely. Matching the style to each room’s needs is smart, not inconsistent. Keep the frame color and material consistent and the mix looks intentional.
