How does window glazing work?

Sunlight carries three types of energy toward your windows. This simulator shows what happens to each one depending on the type of glass.

UV rays — invisible, but they fade your furniture, flooring, and artwork over time.

Visible light — the daylight you see and want inside your home.

Infrared (heat) — invisible heat energy. Too much makes your room uncomfortably hot.

Reflected rays — energy the glass bounces back outside, keeping your room cooler.

Watch the person and painting inside the room react as conditions change. Try different glazing types and scenarios to see the difference.

Glazing Performance Simulator

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Select a glazing type and scenario to begin. Watch what happens inside the room.
4
overcastpeak summer sun
28°C
-20°C freezing45°C extreme heat
UV — fades furniture
Visible — daylight
Infrared — heat
Reflected
Indoor comfort ≤ 26°C comfortable
20°C
Indoor temp
IR (heat) blocked
UV blocked
U-value