What is the difference between single-hung and double-hung windows?

Single-hung windows have only the bottom sash that moves up and down, while double-hung windows have both the top and bottom sashes that can move independently. This fundamental difference affects ventilation, cleaning, and overall functionality.

Single-hung windows are the more basic and affordable option. Only the bottom portion (sash) slides up to open the window, while the top sash remains fixed in place. This design limits your ventilation options since air can only enter from the bottom opening. However, single-hung windows are typically 10-20% less expensive than double-hung models and have fewer moving parts, which can mean less maintenance over time.

Double-hung windows offer much more versatility since both the top and bottom sashes can slide independently. You can open just the bottom for standard ventilation, just the top to let hot air escape while maintaining security, or both for maximum airflow. Many double-hung windows also feature a tilt-in design where both sashes can tilt inward for easy cleaning from inside your home - a huge advantage for second-story windows.

In Ottawa's climate, double-hung windows are often preferred because they allow for better natural ventilation control. During summer, you can open the top sash to let hot air escape while keeping the bottom closed for security, or create a natural convection current by opening both. The cleaning convenience is particularly valuable given our harsh winters when exterior window cleaning becomes challenging.

Energy efficiency is comparable between both styles when you choose quality models with proper sealing. The key factors are the frame material, glass package (double or triple-pane), and installation quality rather than the operating style. For Ottawa homes, focus on windows with U-factors of 1.22 or lower to qualify for energy rebates.

For a quote comparing single-hung and double-hung on your own openings, request one through Ottawa Window Pros.

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