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In order to reduce energy consumption in heated buildings and thus fossil fuels, there is a need for proper modernization of existing buildings and new construction with reduced energy demand. The size and the insulation of windows have a decisive influence on the amount of heat loss. The study looks into the impact of decreased power consumption through optimal use of sunlight through the selection of the size of windows, type of windows, and adjusting the light intensity using an automatic control of lighting according to the amount of sunlight reaching the room. The research related to the differences between the six types of windows in relations to the energy consumption of the building.