What the moving top sash gets you.
Two things. Ventilation: with both sashes open, warm air escapes the top while cooler air comes in the bottom, which moves air better than a single-hung where only the bottom opens. Cleaning: a double-hung sash usually tilts in, so you can clean the outside of both panes from inside, which matters on upper floors. A single-hung is simpler and costs a little less, but you can only open and easily clean the bottom.
If the window is on a ground floor and ventilation is not a priority, single-hung is fine and cheaper. If it is upstairs, or you want the best airflow, double-hung earns the difference.
Common questions.
- What is the difference between double-hung and single-hung windows?
- In a single-hung window only the bottom sash moves and the top is fixed. In a double-hung window both sashes slide, so you can open the top, the bottom, or both. That moving top sash is the only functional difference.
- Are double-hung windows worth the extra cost?
- Double-hung windows are worth it where ventilation or cleaning matter, especially on upper floors, because both sashes open and usually tilt in for cleaning from inside. On a ground floor where you mainly open the bottom, a single-hung does the job for less.
- Which is better for ventilation?
- Double-hung is better for ventilation. Opening the top and bottom sashes together lets warm air leave through the top while cool air enters at the bottom, which moves more air than a single-hung that only opens at the bottom.
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