Energy Performance of External Shading: Reduce Cooling Costs 30-40%
Why external sun protection is 2× more effective than interior blinds: Fc values, solar heat gain calculation and how ZIP screens eliminate the need for air conditioning.
Why External Shading Is 2× More Effective
Interior blinds block 35-65% of heat; external shading blocks 85-95%. The difference: interior shading stops light after it passes through glass — heat is already inside. External shading intercepts heat before the glass. This means 30-40% cooling cost savings.
Fc Value — The Key Metric
The Fc value (solar protection factor) shows how much solar energy passes through. Fc = 0.10 is excellent (90% blocking). Alcodec ZIP screens achieve Fc = 0.05-0.15 — industry-leading values.
ZIP Screens Make AC Optional
In Central European climate, properly sized external shading can eliminate the need for AC in residential buildings. ZIP screens block 95% of solar heat. Building energy class can improve by two grades.
Winter Energy Harvesting
Automated systems open in winter for solar heat gains. Motorised louvre systems use winter sun for free heating. Annual heating cost reduction: 20-30%.
