What is double-glazed window?

A double-glazed window consists of two panes of glass separated by a gap typically 6–20mm filled with air or an inert gas like argon or krypton. This construction creates a thermal barrier that significantly reduces heat transfer between the interior and exterior of a building, improving both energy efficiency and acoustic performance.

How Double Glazing Works

The sealed gap between the two glass panes acts as an insulating layer. Air or argon gas is a poor conductor of heat, so it slows the movement of heat through the window assembly. This reduces heat loss in winter and heat gain in summer, lowering the load on HVAC systems.

Components of a Double-Glazed Unit (DGU)

  • Two glass panes (clear, tinted, or low-e coated)
  • Spacer bar (aluminium or warm-edge spacer) separating the panes
  • Desiccant to absorb any trapped moisture
  • Sealed edges to prevent gas leakage

Double-glazed windows are a worthwhile long-term investment that improves energy performance, comfort, and noise control. As energy costs rise and green building norms become stricter in India, double glazing is transitioning from a luxury feature to a practical standard in quality residential and commercial construction.

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