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That window can send more solar heat in winter season than in summer season. A west-facing window on a summer season's afternoon has an angle of incidence from near 0 as much as 30 with a big efficient area of solar radiation. A north-facing window, in summer season, has a high angle of incidence and a low efficient area of solar radiation, so can transfer less heat than a west-facing one.

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You can quickly and easily improve the thermal performance of your home by changing your windows. There are thousands of types of glass and frames to pick from.

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

The energy performance of IGUs also 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. Wider cavities offer lower (better) U values, with 12mm usually accepted as the preferred space how well the cavity is sealed.

If argon is installed to the cavity in place of air, wetness is reliably omitted the level of desiccant (drying agent). The spacer (metal or polymer strip) that separates the glass layers consists of a desiccant to absorb any moisture. Inadequate desiccant may trigger moisture to condense on the glass surface area in cold conditions, minimizing thermal performance.

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In fact, IGUs can provide better energy efficiency for all environments, specifically in heated and air-conditioned houses. Cross-section detail of single, double and triple-glazing units Low emissivity glass (commonly referred to as low-e glass) minimizes heat transfer. Low-e glass may be either high or low transmission: High transmission low-e glass has a finishing that permits daytime from the sun to enter the house to achieve great solar heat gain, however minimizes the quantity of the long wavelength infrared heat that can escape back through the window.

Low-e glass has either a pyrolytic coating or a vacuum-deposited thin movie metal coating. Pyrolytic coverings are durable and can be used for any glazing; vacuum-deposited coverings are soft and are only utilized within IGUs. Low-e finishes can substantially enhance both U value and SHGC; nevertheless, they need to be used correctly or they will either weaken or stop working to carry out as required.

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Low-e coatings can be used in mix with clear, toned or reflective glass. Low-e finishes on glazing can lower heat transfer where required Image: Department of Market, Science, Energy and Resources Toned glass has colouring ingredients included during manufacture. It is available in different colours, typically bronze, grey, blue and green.