## 3 Results and Discussions
### Annual Variations in the Indoor Air Temperature and Relative Humidity  
Variations in air temperature and humidity act cumulatively on cultural assets and, in the long term, determine their aging. Large variations create stresses on the internal structure of the components of artifacts. From a microclimatic viewpoint, for the entire analyzed interval, the museum building fell within the normal thermal and humidity intervals for the conservation of cultural goods. Thus, the mean temperature inside the building was 19.8 \({}^{\circ}\)C, and the mean relative humidity level was 52.4% (Table 4), for the period February 2020 to January 2021. Regarding the microclimatic variations inside the building, the variations were approximately similar to the thermal and humidity variations recorded outside. Under these conditions, the data loggers located in the northern rooms were 0.3 \({}^{\circ}\)C warmer (Table 5) and 0.6% less humid (Table 6) than the sensors installed in the southern part of the building. The most important feature of the air temperature distribution inside the museum was the higher air temperature in the rooms situated in the northern part of the building. This was an effect of the thermal efficiency of the building which was designed with smaller rooms on its northern flank, that could more easily be kept warm during winter, and larger rooms in the southern flank which could benefit from insolation, even during winter. Thus, the dimensions of the rooms represent a key element of the building infra-climatic stability. \begin{table}
\begin{tabular}{c c c c c c c c c c c c c c} \hline \hline  & & & & & & **2020** & & & & & & **2021** & **Mean** \\  & **F** & **M** & **A** & **M** & **J** & **J** & **A** & **S** & **O** & **N** & **D** & **J** & **Mean** \\ \hline University WS & 69.7 & 63.2 & 44.8 & 67.9 & 70.2 & 63.0 & 57.0 & 62.0 & 80.4 & 83.0 & 86.5 & 81.2 & 69.1 \\ University WS-S5 & 2.9 & 3.3 & 7.0 & 1.6 & \(-\)1.4 & 2.6 & 2.7 & 4.4 & \(-\)3.1 & \(-\)4.0 & \(-\)6.4 & \(-\)4.8 & 0.4 \\ University WS-S6 & 5.6 & 4.2 & 6.6 & 4.3 & 2.0 & 6.5 & 6.5 & 8.0 & 1.2 & 0.2 & \(-\)1.9 & \(-\)1.1 & 3.5 \\ S5 (south outside) & 66.8 & 59.8 & 37.8 & 66.3 & 71.7 & 60.3 & 54.3 & 57.6 & 83.5 & 87.0 & 92.9 & 86.1 & 68.7 \\ S6 (north outside) & 64.1 & 58.9 & 38.3 & 63.6 & 68.3 & 56.5 & 50.5 & 54.0 & 79.1 & 82.8 & 88.4 & 82.3 & 65.6 \\ S5-S6 & 2.7 & 0.9 & \(-\)0.5 & 2.7 & 3.4 & 3.8 & 3.9 & 3.6 & 4.4 & 4.2 & 4.5 & 3.7 & 3.1 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Mean monthly air relative humidity values (%) for exterior data loggers and University weather stations and the differences between exterior data loggers and University weather station (February 2020–January 2021). Figure 6: Mean monthly air relative humidity for exterior data loggers and University weather station (February 2020 to January 2021). According to the data recorded in the museum rooms, the lowest mean monthly air temperature was recorded in April (14.8 \({}^{\circ}\)C in the northern rooms and 14.7 \({}^{\circ}\)C in the southern room), and the highest mean monthly air temperature was recorded in August (25.8 \({}^{\circ}\)C in the northern rooms and 26.0 \({}^{\circ}\)C in the southern room). The minimum air temperature recorded in April represented a consequence of stopping the central heating system of the Museum combined with the lower temperature outside. The differences between the indoor (14.7 \({}^{\circ}\)C) and outdoor (12.6 \({}^{\circ}\)C) mean air temperatures in April were extremely low compared to the rest of the year (12.6 \({}^{\circ}\)C). In Figure 7, it is apparent that the lack of central heating at the beginning of March 2020 caused a rapid decrease in temperature until April followed by a constant increase in the temperature until August. The temperature increases during the summer were correlated with increased values for the outdoor temperature.