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

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But you can quickly and quickly improve the thermal efficiency of your house by replacing your windows. This is one of the most efficient techniques of renovation to achieve improved thermal convenience. There are countless types of glass and frames to select from. Selecting the best ones is very important to enhancing the energy efficiency of your house.

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Single glazing with clear glass is not very effective when it comes to heat loss or gain. To improve efficiency, 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 also depends on: the properties 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. Cavity thickness is typically 6 to 18mm. Wider cavities supply lower (better) U worths, with 12mm usually accepted as the preferred gap how well the cavity is sealed. Cavities should be dry and well sealed to avoid wetness getting in.

If argon is installed to the cavity in place of air, moisture is reliably left out the level of desiccant (drying agent). The spacer (metal or polymer strip) that separates the glass layers contains a desiccant to take in any moisture. Insufficient desiccant may trigger wetness to condense on the glass surface in cold conditions, decreasing thermal performance.

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IGUs can provide better energy efficiency for all environments, especially in heated and air-conditioned houses. Cross-section detail of single, double and triple-glazing units Low emissivity glass (commonly called low-e glass) decreases heat transfer. Low-e glass might be either high or low transmission: High transmission low-e glass has a covering that enables daytime from the sun to pass into your house to accomplish great solar heat gain, but lowers the amount of the long wavelength infrared heat that can get away back through the window.

Low-e glass has either a pyrolytic coating or a vacuum-deposited thin film metal covering. Pyrolytic coverings are durable and can be used for any glazing; vacuum-deposited coverings are soft and are only used within IGUs. Low-e finishes can significantly improve both U worth and SHGC; nevertheless, they need to be utilized properly or they will either degrade or fail to perform as required.

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Low-e coatings can be utilized in combination with clear, toned or reflective glass. Low-e coatings on glazing can decrease heat transfer where required Image: Department of Industry, 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.