Performance guide
Double-Pane Windows
A window glazing configuration with two panes separated by a sealed space in an insulated-glass unit.
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Glass and performance
Use ratings and features to compare complete window options.
A feature name alone does not establish project fit. Compare complete-product ratings, climate context, installation assumptions, and documented limitations.
- Compare complete window options
- Clarify installation and finish scope
- Review written proposals
Glass and performance
Start with the complete window, then compare the specification
Pane count, coatings, safety glazing, sound control, and certification are compared through the exact product configuration and its documentation. Use the guides below to organize each decision.
One complete product
Compare ratings for the exact configuration
Match the label to the window style, size, frame, glazing package, and operating configuration named in the proposal.
Performance guide
Triple-Pane Windows
A glazing configuration with three panes and two intervening spaces in an insulated-glass unit.
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Low-E Glass
Window glass with a low-emissivity coating designed to change radiative heat transfer through the glazing.
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NFRC Window Ratings
Standardized ratings for the energy performance of complete window, door, and skylight products in specified configurations.
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ENERGY STAR Windows
Complete window products independently certified to meet current ENERGY STAR performance criteria for applicable climate zones.
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Impact-Resistant Glass
Glazing used within a tested window or door assembly intended to resist specified impact and pressure conditions.
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Tempered and Safety Glass
Glazing selected and tested for safety applications; tempered glass is one safety-glazing type, while other compliant constructions may be used in applicable products and locations.
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Sound-Control Windows
Window configurations evaluated for reducing sound transmission through the complete opening without promising complete soundproofing.
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