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

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However you can rapidly and quickly enhance the thermal performance of your house by changing your windows. This is among the most efficient methods of renovation to achieve improved thermal comfort. There are thousands of types of glass and frames to pick from. Selecting the right ones is important to improving the energy performance 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 enhance efficiency, you can use single glazing with a more energy-efficient type of glass such as low emissivity (low-e) glass.

Several layers can be assembled with sealed cavities between each sheet of glass. IGUs usually offer better energy performance than single glazing, since they transfer less energy. Nevertheless, the energy efficiency of IGUs also depends upon: the residential or commercial properties of each layer of glass. Different glass types (for example, clear and low-e glass) can be assembled 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 generally 6 to 18mm. Broader cavities provide lower (better) U worths, with 12mm usually accepted as the preferred gap how well the cavity is sealed. Cavities need to be dry and well sealed to avoid wetness getting in.

If argon is installed 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 soak up any wetness. Inadequate desiccant may cause wetness to condense on the glass surface area in cold conditions, reducing thermal performance.

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In fact, IGUs can deliver better energy performance for all climates, particularly in heated and air-conditioned homes. Cross-section information of single, double and triple-glazing systems Low emissivity glass (frequently called low-e glass) reduces heat transfer. Low-e glass may be either high or low transmission: High transmission low-e glass has a covering that permits daytime from the sun to enter the house to accomplish great solar heat gain, however lowers the quantity 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 coating. Pyrolytic coverings are long lasting and can be used for any glazing; vacuum-deposited coatings are soft and are just utilized within IGUs. Low-e coverings can considerably improve both U value and SHGC; however, they need to be used correctly or they will either deteriorate or fail to carry out as required.

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