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

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You can quickly and easily enhance the thermal efficiency 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 extremely efficient when it comes to heat loss or gain. To enhance 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 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. Cavity density is generally 6 to 18mm. Larger cavities provide lower (better) U values, with 12mm usually accepted as the preferred space how well the cavity is sealed. Cavities need to be dry and well sealed to prevent wetness getting in.

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

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IGUs can provide better energy performance for all climates, particularly in heated and air-conditioned homes. Cross-section detail of single, double and triple-glazing units Low emissivity glass (frequently understood as low-e glass) minimizes heat transfer. Low-e glass may be either high or low transmission: High transmission low-e glass has a covering that permits daylight from the sun to enter the house to attain great solar heat gain, but decreases the amount of the long wavelength infrared heat that can leave back through the window.

Low-e glass has either a pyrolytic finishing or a vacuum-deposited thin movie metal finish. Pyrolytic coatings are durable and can be utilized for any glazing; vacuum-deposited finishes are soft and are just utilized within IGUs. Low-e finishes can considerably enhance both U value and SHGC; nevertheless, they need to be utilized 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 finishes on glazing can lower heat transfer where needed Image: Department of Market, Science, Energy and Resources Toned glass has colouring ingredients included during manufacture. It is readily available in various colours, normally bronze, grey, blue and green.