External shading devices are the most effective in reducing heat gains because they intercept and dissipate most of the heat in solar radiation before it reaches the buildings surface.
Saving energy becomes more and more important. Retractable awnings do both, protecting buildings from overheating (no air conditioning required) and allowing the sun to warm the interior (less heating).
Without protection 100% of solar thermal energy radiation will enter the building if normal glass is used and approximately 60% if normal double glazing is used. With a markilux awning it is possible to achieve a 95% reduction in solar thermal energy radiation.