DECN/C2TN team will be responsible for activities related to Indoor Air Quality (IAQ), which is essential to guarantee the health and performance of the buildings’ occupants. Firstly, it will be defined the requirements of the HVAC project in order to guarantee the IAQ. After building the pilot, the working group will use a set of equipment and methodologies to evaluate IAQ chemical, physical and microbiological parameters, identify the factors that influence it and define improvement measures.