Reduce heat gain through windows

Retractable awning over a door and window of a house

Windows can let a lot of heat into your home during summer, especially if you have large west, east and north-facing windows that are not adequately shaded. Fortunately there are simple steps you can take to reduce heat gain through your windows.

Size and orientation

The size and orientation of your windows will affect the amount of sunlight entering your home. West, east and north-facing windows tend to be exposed to sunlight, while south-facing windows receive almost no direct sunlight. The orientation of your windows also influence how you use coverings and shading. Consider the orientation of your windows if you are planning a renovation.

Frames and glazing treatments

The strength of window frames, together with the glazing component, can greatly affect the energy efficiency of windows. The most energy efficient window frames are made from materials that won’t transfer heat and cold, such as timber, uPVC or combination frames.

Coverings and shading

Windows can let a lot of heat in during summer, especially if you have large unshaded west, east and north-facing windows. It is better to stop the sun's heat from reaching the glass, than deal with the heat once it has entered your home. External shading is therefore much more effective at keeping your home cool than internal blinds or curtains, but using both external and internal window coverings will provide maximum protection.


Heat is both gained and lost from existing houses due to air leakage or draughts. Seal gaps around doors and windows to draught proof your home and save energy and money.

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