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Energy efficient windows

Energy efficient windows are window systems designed to reduce heat transfer between indoors and outdoors. They help keep your home warmer in winter and cooler in summer, which can lower heating and cooling energy use. Key performance areas include insulation (how well the window slows heat flow), air leakage (how much

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  1. What “energy efficient windows” means

    Energy efficient windows are window systems designed to reduce heat transfer between indoors and outdoors. They help keep your home warmer in winter and cooler in summer, which can lower heating and cooling energy use. Key performance areas include insulation (how well the window slows heat flow), air leakage (how much uncontrolled air passes through gaps), and solar control (how much sunlight/heat enters).

  2. Common features to look for

    Look for a low U-factor (better insulation) and a low Solar Heat Gain Coefficient (SHGC) if you want to limit heat from sunlight. Double- or triple-pane glass, low-emissivity (low‑E) coatings, and gas fills like argon or krypton can improve insulation. Quality frames (e.g., vinyl, fiberglass, or thermally broken metal) and proper installation (sealed, insulated gaps) are often as important as the glass itself. Some windows also include features like insulated spacers and weatherstripping to reduce drafts.

  3. How to choose and verify performance

    Use product labels and energy ratings from credible sources (often based on standardized testing). Compare U-factor and SHGC for your climate and orientation (south-facing windows may benefit more from solar control). If you’re replacing windows, prioritize airtight installation and consider whole-window performance rather than only glass specs. For best results, consult local energy-efficiency guidance or a qualified installer.

FAQ

Do energy efficient windows reduce drafts?

Yes, they often reduce drafts by improving air sealing and using better frame and glazing systems, especially when installed correctly.

Are low‑E windows always best?

Low‑E coatings generally improve efficiency, but the optimal type depends on climate and whether you want more solar heat gain or less.

Will energy efficient windows lower my utility bills?

They can, especially in climates with significant heating or cooling needs, but savings depend on existing insulation, HVAC efficiency, and installation quality.

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