Enviroblinds external shading devices are much more effective in providing passive cooling than window solar film and internal curtains. Our shutters and screens prevent heat loss during cold weather, solar film has no impact on this but heavy internal curtains are also effective. The consumption of energy for lighting a room is very little impacted with the use of our screens and venetian blinds. Enviroblinds external shutters are fully adjustable and provide effective blackout. Solar film and drawn curtains result in an increase of lighting demand.