Intelligent buildings integrate technological systems, communications, and controls to create flexible, effective, comfortable, and secure environments for owners, operators, and occupants. Green buildings are high-performance buildings that maximize user comfort and productivity while minimizing environmental impact through integration of technologies, materials, and design features. Technologies and integrated intelligent building systems can help buildings achieve energy efficiency objectives and meet the needs of those constructing or retrofitting green buildings. Accessibility and affordability of these technologies is a consideration.