Sun shading influences how much solar energy enters a building through its windows. External sun shading can limit solar heat gains in summer. In winter, open systems can allow solar gains, while closed roller shutters can reduce additional heat loss through windows at night. An automated control system adjusts the sun shading according to the weather, time of day and use.
An IVRSA study shows potential savings of up to 70% in cooling energy and up to 30% in heating energy for the building scenarios examined, compared with windows without sun shading. The actual effect depends on factors including the building, glazing, use, weather and control system.
External sun shading reduces solar heat gains before they reach the glazing. This can limit cooling loads in summer. In winter, sunlight can be used effectively during the day. When roller shutters are closed, the air pocket they create in front of the window can also reduce heat transfer. The extent of the effect depends on the installation and how the building is used.
Where air conditioning is required, sun shading can further reduce the energy needed for cooling because the air-conditioning system has less heat to remove from the room. An automated control system helps deploy the sun shading at the right time based on sunlight, time of day or temperature – even when no one is at home. The potential savings depend on the building and its operating conditions.
As temperatures rise and periods of extreme heat become more frequent, protection against overheating is becoming increasingly important. In non-air-conditioned buildings, the focus is primarily on indoor comfort: less solar heat enters the room, helping to maintain more comfortable temperatures on hot days.
Energy-efficiency measures for buildings may qualify for funding programmes from the German federal government, the federal states or local authorities. Eligibility, minimum technical requirements and application procedures may change. Before commissioning any work, check the current requirements and, if necessary, seek advice from an energy efficiency expert.
Anyone who considers sun shading during planning or renovation can coordinate indoor comfort and the building's energy consumption more effectively. WAREMA's project consulting team can support you from the planning phase onwards.
Visit us at one of our Sunlight Experience Centres or contact your local WAREMA specialist retailer for advice and a project-specific quotation. The specialist dealer search helps you find a suitable contact in your area.
From new builds and renovations to windows, doors and outdoor areas: Discover planning aids, guides and inspiration on sun shading, insect and pollen protection, as well as information on comfort, security and energy efficiency.