Horizontal Rolling vs. Single Hung vs. Casement Windows

A horizontal rolling window (slider) has one or two sashes that glide sideways on rollers along a track in the sill. A single hung window has a fixed upper sash and a lower sash that lifts vertically, held by balances inside the frame. A casement window is hinged on one side and swings outward with a crank, closing against a compression seal around the whole perimeter.

All three are available as laminated impact units in white or bronze aluminum frames, with clear, gray or Low-E glass and, on selected sizes, a privacy white interlayer. The difference is in how they open, how they seal, what they cost and where they fit.

Rolling and single hung windows open roughly half their glass area. The rolling window's opening is vertical and tall; the single hung's is horizontal and low, close to the sill. A casement opens its entire sash, so it moves more air for its size and can be angled to catch a breeze coming along the wall.

Egress matters in sleeping rooms. The Florida Building Code requires an emergency escape and rescue opening with a minimum net clear opening — commonly cited as 5.7 square feet with minimum clear height and width — and the clear area is measured with the window open, not from the glass size. Casements often reach egress in a smaller frame than sliders or single hungs. Confirm the requirement with your permitting office and check the product's clear-opening figures before buying for a bedroom.

• Horizontal rolling: half screen on the operable side; easy to remove and clean.
• Single hung: half screen on the lower sash, or a full screen on some series.
• Casement: screen mounts on the inside, since the sash swings out; the crank handle sits below the screen.

Mixing styles on one facade is normal, but keep sightlines aligned: a rolling window next to a single hung will have meeting rails at different heights unless the sizes are chosen with that in mind.

• Horizontal rolling: wide openings — living rooms, dining rooms, Florida rooms, and bedrooms in 1960s-to-1990s block houses where the original windows were sliders or awnings.
• Single hung: tall, narrow openings and houses with a traditional look; the most common one-for-one replacement in older Miami and Hialeah neighborhoods.
• Casement: over kitchen counters and sinks where a crank is easier than lifting, bathrooms, stairwells, and anywhere maximum airflow or egress in a tight frame is needed.
• Fixed and picture units pair with any of the three when part of the wall does not need to open.

Within the same series and glass, casements generally cost the most because of hinges, operators and multipoint locks; rolling and single hung windows are usually closer to each other, with price following glass area. Large rolling windows reach sizes a single hung cannot, which is why they dominate wide openings.

Maintenance differs. Rolling windows need a clean, dry track and occasional roller care. Single hungs rely on balances that eventually wear. Casements need the crank and hinges kept clean and should not be left open in heavy rain. Because the sash compresses against the seal, casements often achieve higher design pressures at a given size — worth checking in the NOA when a coastal or upper-floor opening needs a high PSF.

Use this as a starting point and let the opening size, the egress requirement and the approval tables make the final call.

• Best for wide openings: horizontal rolling.
• Best for tall, narrow openings and a traditional look: single hung.
• Best ventilation and tightest seal: casement.
• Simplest operation and lowest hardware cost: rolling and single hung.
• Egress in a small frame: casement, subject to the product's clear-opening data.
• All three: laminated impact glass, white or bronze frames, approvals confirmed per series and size.