Energy demand of different glazing materials and light control systems for office spaces are analyzed in this paper. The approach is based on an improvement of the hourly simulation program IENUS (Integrated ENergy Use Simulation), that was developed to assess building energy demand taking into account the integration between visual and thermal aspects. IENUS implements thermal aspects by the transfer function method, while daylighting is pre-processed by the package Superlite before entering in IENUS. Energy requirements are analyzed for different glazing systems and daylight control strategies.