You Chose the Glass Carefully, but the Whole Window Still Feels Different—The Problem Is the Part You Overlooked

The glass isn't the problem—the frame is. Whole-window U-value ≠ glass U-value, and the 20–30% of area you ignore can raise it more than you'd think.

Aluminum conducts heat roughly 940× faster than PVC—and it's hiding in most window frames. Even with premium glazing, a highly conductive frame creates a thermal bridge that turns the edge of your window into a cold zone in winter and a hot zone in summer. This guide covers frame-material thermal conductivity, thermally broken aluminum's real limits, and why whole-window U-value—not center-of-glass U-value—is the number that matters, with a worked example from 0.8 glass to a 1.2–1.5 whole-window result.

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Lianfengzhen, Liancheng County, Longyan, Fujian, China, 366299

FUJIAN SUPERTECH ADVANCED MATERIAL CO.,LTD.

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