Why external sun protection is 2× more effective than interior blinds: Fc values, solar heat gain calculation and how ZIP screens can reduce cooling load by project.
Interior blinds control sunlight after it passes through the glass; external shading reduces heat before it reaches the glazing. Savings should be calculated per project using orientation, glass area, fabric openness and climate data.
The Fc value (solar protection factor) shows how much solar energy passes through. Fc = 0.10 indicates strong solar protection. Alcodec ZIP screens are selected around target Fc value, fabric openness, glazing and facade orientation.
Properly sized external shading can reduce AC demand in residential buildings; the final effect depends on climate, glazing and operation schedule.
Automated systems open in winter for solar heat gains. Motorised louvre systems use winter sun for free heating. Heating impact should be calculated per project.
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