## 2 Materials and Methods
### Indoor Environmental Quality  
To achieve a thorough understanding of the building's IEQ, an investigation campaign was performed over the course of an academic year, specifically from October 2023 to September 2024. Data were gathered through a series of targeted measurement sessions. These sessions were conducted in various classrooms within the building, with the measurements taken on multiple days of each month throughout the study period. Throughout this time frame, we measured the indoor temperature (T\({}_{\text{a}}\)), radiant temperature (T\({}_{\text{r}}\)), humidity level (H), air velocity (V\({}_{\text{a}}\)), illumination, sound level, and CO\({}_{2}\) concentrations. To facilitate this comprehensive monitoring process, a universal IAQ instrument, namely the Testo 400 equipped with various probes, and a Testo 815 sound level meter were employed. Both instruments adhered to the standards outlined in [43]. A summary of these instruments' technical specifications is provided in Table 1.  
The field measurement activities encompassed an assessment of the IEQ across a variety of classrooms within the educational facility. A comprehensive review of the recommended standards presented in sources [44; 45] guided the selection of the optimal locations for the measuring devices. The placement of these instruments within the classrooms was meticulously determined to ensure accurate data collection, as illustrated in Figure 3.  
The measuring devices were positioned around the central area of the occupied space at a height of 1.1 m to ensure accurate readings. To reduce any local disturbances, a safety distance of at least 1 m was maintained from all possible sources of interference, which included people, walls, and windows. In accordance with the guidelines established by [44], the metabolic rate associated with a typical sedentary task was quantified as 1.0 met. An observational method was employed to assess how insulated students were by their clothing. These data enabled the calculation of the PMV, which provided valuable information about thermal comfort in the educational setting. Additionally, for the assessment of the artificial lighting conditions, a measurement grid was established in accordance with point 4.4 from reference [46] and set at a height of 0.8 m to facilitate precise evaluations.  
\begin{table}
\begin{tabular}{c c c c c} \hline
**Instrument** & **Probe** & **Parameter** & **Range** & **Accuracy** \\ \hline \multirow{8}{*}{Testo 400} & \multirow{2}{*}{Universal IAQ} & Indoor temperature & \(-\)40 to +150 \({}^{\circ}\)C & \(\pm\)0.2 \({}^{\circ}\)C \\  & & Absolute pressure & 700 to 1100 hPa & \(\pm\)3 hPa \\  & & Indoor temperature & 0 to +50 \({}^{\circ}\)C & \(\pm\)0.5 \({}^{\circ}\)C \\ \cline{3-5}  & CO\({}_{2}\) & Humidity & 5 to 95\%RH & \(\pm\)1.0\%RH \\ \cline{3-5}  & \multirow{2}{*}{Globe thermometer} & Ambient CO\({}_{2}\) & 0 to 10,000 ppm & \(\pm\)50 ppm \\ \cline{3-5}  & & Radiant temperature & 0 to +120 \({}^{\circ}\)C & Class 1 \\ \cline{3-5}  & Lux probe & Illuminance & 0 to 100,000 lx & \(\pm\)3 lx \\ \cline{3-5}  & \multirow{2}{*}{Turbulence} & Indoor temperature & 0 to +50 \({}^{\circ}\)C & \(\pm\)0.5 \({}^{\circ}\)C \\ \cline{3-5}  & & Velocity & 0 to 5 m/s & \(\pm\)0.03 m/s \\ \hline Testo 815 & & Sound level & 32 \(\div\) 130 dB & \(\pm\)1.0 dB \\ \hline \end{tabular}
\end{table}
Table 1: Technical specifications of equipment used.