Windows

What Is a Double Hung Window?

A double hung window is a window with both an upper sash and lower sash that can move for ventilation.

Understanding Double Hung Windows

Double Hung Window: A double hung window is a window with both an upper sash and lower sash that can move for ventilation.

Published: June 4, 2026 Reviewed: June 4, 2026 Updated: June 4, 2026 By Exterior Echelon

A double hung window has two operable sashes. The lower sash can move up and the upper sash can move down, giving homeowners more ventilation options.

Why It Matters

Double hung windows are one of the most recognizable residential window styles. They can fit traditional home designs while providing more flexible airflow than a single hung window.

Common Problems

Common issues include worn sash balances, air leaks, fogged glass, loose locks, sticking sashes, damaged screens, and water problems caused by poor flashing or exterior trim details.

Building Codes & Industry Standards

Double hung windows should follow manufacturer installation instructions, local energy requirements, egress rules where applicable, safety glass requirements where required, and water-management details around the opening.

Exterior Echelon Notes

Exterior Echelon looks beyond the window unit itself and checks the surrounding trim, siding, flashing, and wall conditions that affect long-term performance.

Double hung window on a residential exterior
Double hung windows allow both the upper and lower sash to move.

Related Terms

Continue learning with connected glossary definitions.

Single Hung Window

Windows

A single hung window is a window with a lower sash that moves up and down while the upper sash stays fixed.

Window Flashing

Windows

Window flashing is the water-management detail around a window opening that helps direct water away from the wall assembly.

Casement Window

Windows

A casement window is a hinged window that opens outward, usually with a crank handle.

Picture Window

Windows

A picture window is a fixed window that does not open and is often used for larger views and natural light.

Air Barrier

Exterior Weather Barriers

An air barrier is a material or system intended to limit uncontrolled air movement through a building assembly.

Awning Window

Windows

An awning window is a hinged window that opens outward from the bottom, with the hinge at the top.

Glossary Note

This glossary is provided for general homeowner education. Actual roofing, siding, gutter, window, and exterior remodeling conditions should be evaluated by a qualified contractor before making repair, replacement, or insurance claim decisions.

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