Double-Hung Window - Operable Sash Guide for Homes
A double-hung window is a window with two operable sashes that slide vertically within the frame.
What It Is
In a double-hung window, both the upper and lower sash can move, which gives the homeowner more ventilation control than a single-hung design. Opening the top and bottom at the same time can improve airflow.
These windows are common in both new and older homes because they fit many architectural styles and can be cleaned from the inside when they have tilt-in sashes.
Where It Is Used
Double-hung windows are used in bedrooms, living areas, upper floors, and traditional exterior elevations throughout the house.
How to Identify One
The window has two stacked sashes in the same frame, and both are designed to move up and down. Many modern versions include tilt latches for cleaning.
Replacement
Replacement is needed when the sashes stick, balances fail, seals break down, or the frame leaks air or water. Homeowners may replace the sash components alone or the entire window depending on the condition.
Frequently Asked Questions
Double-Hung Window — FAQ
- What is the difference between a double-hung and single-hung window?
- A double-hung window has two movable sashes, while a single-hung window usually has only the lower sash operable.
- Why won't my double-hung window stay open?
- The balance system is often worn or broken. That system is what helps support the sash at the chosen height.
- Are double-hung windows good for ventilation?
- Yes. They allow airflow at both the top and bottom, which can improve natural ventilation in mild weather.
- When should a double-hung window be replaced?
- Replacement makes sense when the frame leaks badly, the sashes no longer operate reliably, or the repair cost approaches the value of a full new unit.
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