The overall performance of a window is dependent on the combined effect of frame and glazing components and the air-tightness of the finished window. Ratings maybe improved by decreasing thermal losses.

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Decreasing thermal losses

- Type of Low-E glass: with its optimized balance of very low emissivity and high solar gain SGG PLANITHERM can improve the energy index for a given window

- Inert Gas filling: argon gas filling can improve the energy index for a given window compared to an air filled unit

- Optimized cavity width: the optimum cavity width for an argon filled unit is 15mm (10mm with Krypto)

- Warm edge spacer: Using SGG SWISSPACER can improve the energy index for a given window compared to standard aluminum spacer bars

- Triple glazing: can further reduce glazing U values

- Frame type: U values can be reduced with advanced materials and design