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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 as much as 30 with a large efficient 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 transmit less heat than a west-facing one.

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You can rapidly and quickly improve the thermal efficiency of your house 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 efficient when it comes to heat loss or gain. To enhance efficiency, 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 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 usually 6 to 18mm. Larger cavities offer lower (better) U values, with 12mm typically accepted as the favored gap how well the cavity is sealed. Cavities must be dry and well sealed to avoid wetness getting in.

If argon is set up to the cavity in location of air, wetness is reliably left out the level of desiccant (drying agent). The spacer (metal or polymer strip) that separates the glass layers includes a desiccant to absorb any moisture. Insufficient desiccant may cause moisture to condense on the glass surface area in cold conditions, reducing thermal efficiency.

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In reality, IGUs can deliver much better energy performance for all environments, specifically in heated and air-conditioned houses. Cross-section detail of single, double and triple-glazing systems Low emissivity glass (typically understood as low-e glass) reduces heat transfer. Low-e glass might be either high or low transmission: High transmission low-e glass has a finish that enables daytime from the sun to enter your home to accomplish great solar heat gain, however reduces the quantity of the long wavelength infrared heat that can leave back through the window.

Low-e glass has either a pyrolytic coating or a vacuum-deposited thin film metal finishing. Pyrolytic coatings are durable and can be used for any glazing; vacuum-deposited finishings are soft and are only used within IGUs. Low-e coatings can considerably enhance both U value and SHGC; however, they must be used properly or they will either degrade or fail to carry out as required.

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Low-e finishings can be utilized in combination with clear, toned or reflective glass. Low-e coverings on glazing can reduce heat transfer where required Image: Department of Industry, Science, Energy and Resources Toned glass has colouring additives included throughout manufacture. It is offered in different colours, typically bronze, grey, blue and green.