Single-Hung vs Double-Hung Windows — What’s the Difference?

Overview
Single-hung and double-hung windows can look similar, but the difference is in how the sashes operate. (A sash is the part of the window that holds the glass and can move.)

Single-hung windows

• Top sash is fixed
• Bottom sash moves vertically
• Simple, efficient, and widely used

Double-hung windows

• Both sashes move independently
• More flexible airflow control
• Often easier for maintenance/cleaning, depending on placement

Are double-hung windows more energy efficient?
Both types can be energy efficient. The biggest factor is proper installation. Double-hung windows often provide improved ventilation, which can help regulate indoor temperature.

Can I use both types in the same home?
Yes. Many customers choose both styles as part of their California replacement window upgrades.

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