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That window can transfer more solar heat in winter than in summertime. A west-facing window on a summer's afternoon has an angle of incidence from near 0 up to 30 with a large effective area of solar radiation. A north-facing window, in summer, has a high angle of incidence and a low reliable area of solar radiation, so can transmit less heat than a west-facing one.

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You can rapidly and easily enhance the thermal performance of your home by replacing your windows. There are thousands of types of glass and frames to choose from.

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Single glazing with clear glass is not very effective when it comes to heat loss or gain. To improve performance, you can use single glazing with a more energy-efficient type of glass such as low emissivity (low-e) glass.

The energy efficiency of IGUs likewise depends on: the homes of each layer of glass. Different glass types (for example, clear and low-e glass) can be put together in an IGU.

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IGU cavities can be filled with air or a more inert, low-conductivity gas such as argon the width of the cavity. Larger cavities offer lower (better) U worths, with 12mm typically accepted as the preferred gap how well the cavity is sealed.

If argon is installed to the cavity in place of air, moisture is reliably excluded the level of desiccant (drying agent). The spacer (metal or polymer strip) that separates the glass layers includes a desiccant to soak up any moisture. Insufficient desiccant may trigger moisture to condense on the glass surface in cold conditions, minimizing thermal performance.

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IGUs can provide much better energy efficiency for all environments, especially in heated and air-conditioned houses. Cross-section information of single, double and triple-glazing units Low emissivity glass (commonly understood as low-e glass) reduces heat transfer. Low-e glass may be either high or low transmission: High transmission low-e glass has a finish that allows daytime from the sun to pass into your home to achieve excellent solar heat gain, however minimizes the amount of the long wavelength infrared heat that can escape back through the window.

Low-e glass has either a pyrolytic finish or a vacuum-deposited thin movie metal finishing. Pyrolytic coatings are resilient and can be used for any glazing; vacuum-deposited finishes are soft and are just utilized within IGUs. Low-e coatings can significantly improve both U value and SHGC; however, they must be used correctly or they will either weaken or fail to perform as required.

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Low-e coatings can be used in combination with clear, toned or reflective glass. Low-e coatings on glazing can minimize heat transfer where needed Image: Department of Market, Science, Energy and Resources Toned glass has colouring ingredients included throughout manufacture. It is readily available in various colours, generally bronze, grey, blue and green.