## 2 Materials and Methods
### Indoor Conditions  
The indoor conditions were monitored using three multifunctional data loggers labeled 66, 72, and 84. Data collection was conducted using the VOLTCRAFT(r) software suite. The trends from the central sensor (number 66) are presented in Figure 5, reflecting the average room conditions. Sensors 72 and 84 were placed near the wall to monitor the temperature at the boundary conditions for the simulation assessment (Figure 5). The influence of external weather is clearly visible, particularly on the rainy day of 31 August 2020, when the temperature dropped by 5.5 \({}^{\circ}\)C. Additionally, the day-night cycles exhibited a reduced sinusoidal variation compared to the outside, with an average difference of 4 \({}^{\circ}\)C and 10% RH. The maximum recorded temperature indoors was 32.4 \({}^{\circ}\)C on 31 July 2020, at 12:35, which corresponded to the outdoor maximum with a delay of approximately 2 h and 45 min. Conversely, the minimum indoor temperature of 23 \({}^{\circ}\)C occurred on 1 September 2020, at 08:35, also matching the outdoor temperature with a delay of about 1 h and 45 min. The mean temperature throughout the experimental campaign was 28.4 \({}^{\circ}\)C, which is 0.7 \({}^{\circ}\)C lower than the measurement uncertainty for both the indoor and outdoor temperature sensors (\(\pm\)1.3 \({}^{\circ}\)C). The relative humidity varied from a maximum of 70.4% RH on 29 July 2020, at 03:05 to a minimum of 44.8% RH on 22 August 2020, at 15:05, with an average of 58.9% RH; this is 0.5% RH higher than outside and within the error bands of the instruments (\(\pm\)5% RH). The dew point, critical for conservation, was calculated by the software and showed a maximum of 23.9 \({}^{\circ}\)C on 2 August 2020, at 22:05, and a minimum of 14.9 \({}^{\circ}\)C on 26 June 2020, at 05:35, with an average value of 19.5 \({}^{\circ}\)C.  
Sensor 72 was installed on the North-West wall, which is thinner compared to the South-East wall. This difference results in higher temperatures and creates sharp peaks in the maximum temperature readings. The highest temperature recorded by this sensor was 34.3 \({}^{\circ}\)C on 25 July 2020, at 10:35, while the lowest was 23.8 \({}^{\circ}\)C on 1 September 2020, at 09:05, leading to an average temperature of 28.6 \({}^{\circ}\)C. For dew point temperatures, the maximum measured was 24.5 \({}^{\circ}\)C on 3 August 2020, at 00:05, and the minimum was 15.2 \({}^{\circ}\)C on 5 August 2020, at 00:05, with an average of 19.9 \({}^{\circ}\)C. The humidity readings showed a maximum of 71.9% RH on 9 July 2020, at 02:35, a minimum of 43.6% RH on 26 July 2020, at 10:35, and an average of 59.6% RH. Sensor 84 was located on the South-East wall, which has the greatest thickness compared to the other walls. This increased thickness provides better insulation and greater thermal inertia, leading to lower wall temperatures and a longer thermal response time. For this sensor, the maximum temperature recorded was 32.1 \({}^{\circ}\)C on 31 July 2020, at 12:35, while the minimum was 24.1 \({}^{\circ}\)C on 1 September 2020, at 08:35, with an average of 28.7 \({}^{\circ}\)C. The temperature variability is slightly lower, with a range of 8 \({}^{\circ}\)C between the minimum and maximum readings, compared to 10.5 \({}^{\circ}\)C for the North-West wall and 9.4 \({}^{\circ}\)C in the center of the room. This reduced variability is likely due to the better insulation. Additionally, the maximum temperature was not reached on the same day. The absolute minimum temperature was recorded in the center of the room, possibly influenced by the roof skylight. The relative humidity for this sensor peaked at 71.6% RH on 15 August 2020, at 06:05, dropped to a minimum of 48.1% RH on 26 July 2020, at 18:35, and averaged 61.2% RH.