Abstract-As the building sector is responsible for a large portion of total primary energy consumption in developed countries, it is crucial to improve energy efficiency of buildings' systems. Heating, ventilation, and air conditioning systems play a noticeable role in energy consumption of buildings, therefore, developing efficient strategies for ventilation not only can provide comfortable indoor climate but can also mitigate energy consumption in buildings, which, consequently, will lessen the associated environmental impacts. This paper presents development steps of an intelligent window-based hybrid ventilation system in an ongoing research and development project at the University of Coimbra, known as the Smart Window project. Firstly, the motivation and objectives of the project are provided. Secondly, the current state of development of the project as well as the test condition and location in an Indoor Live Lab is presented. Finally, the future steps of development of the project accompanied by the expecting results are presented and discussed.Index Terms-Control strategies, demand-controlled ventilation, energy efficiency, hybrid ventilation, indoor environmental quality, Smart Window.

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