I. Introduction
Ensuring healthy and comfortable environment has become a primary issue for researchers, as the Indoor Environmental Quality (IEQ), including the aspects of air quality, thermal comfort, visual and acoustical quality, can improve the performance of building's occupants [1]. Indoor comfort is particularly relevant for every kind of building, including the ones that present particular characteristics, such as ancient storage rooms [2] or even prisons [3]. Considering air quality, there is to notice that indoor air pollution can have consequences on people's health and comfort [4] therefore studies to evaluate the concentration of pollutants and in particular of CO2 have been recently developed, also in order to achieve higher energy efficiency of buildings [5]. Then, lighting and acoustic aspects can be determinant to ensure comfort in spaces like educational rooms [6]–[7], hospitals [8] or dining rooms [9]. Finally, the evaluation of the thermal environment is specifically significant, especially in spaces such as residential buildings [10], educational rooms [11], but also hospitals [12] or sport facilities [13]. The thermal environment can be influenced by several factors, like the outdoor conditions [14], which can bring overheating especially in summer period [15] or the building function [16]. The building envelope can also have a great impact on the indoor thermal parameters, as the behaviour of the building is influenced by the characteristics of external and internal walls [1 7], by the presence of ventilated roofs [18] and can be particularly important especially for lightweight housing [19].