## 3 Results and Discussions
### Annual Variations in the Indoor Air Temperature and Relative Humidity
The basement recorded a clear inertial effect, with an annual maximum at the beginning of September, even though the maximum air temperature in the museum rooms was recorded at the beginning of July. The difference in the annual daily maximum temperature between rooms and basement was almost 4 \({}^{\circ}\)C.  
Stopping the central heating caused an uncontrolled increase in the relative humidity (Figure 8). The increase in air humidity in the museum's rooms was closely correlated with the humidity recorded in the basement, which propagated through the elevator shaft. Two peaks in the annual evolution of relative humidity occurred, one related to the increase in absolute humidity in June, and the second corresponding to the decrease in temperature in October. \begin{table}
\begin{tabular}{c c c c c c c c c c c c c} \hline  & & & & & **2020** & & & & & **2021** & **Mean** \\  & **F** & **M** & **A** & **M** & **J** & **J** & **A** & **S** & **O** & **N** & **D** & **J** & **Mean** \\ \hline S1 north indoor & 40.5 & 47.8 & 51.2 & 57.5 & 64.4 & 56.0 & 52.2 & 53.3 & 64.1 & 57.3 & 45.3 & 42.7 & 52.7 \\ S4 north indoor & 40.3 & 45.1 & 49.6 & 56.2 & 63.9 & 55.7 & 52.1 & 52.5 & 61.8 & 55.6 & 45.1 & 41.6 & 51.6 \\ S2 south indoor & 41.2 & 48.0 & 50.6 & 57.5 & 64.0 & 55.3 & 51.6 & 52.9 & 65.1 & 57.7 & 46.0 & 43.4 & 52.8 \\ S3 basement & 48.3 & 53.1 & 55.4 & 71.2 & 81.3 & 72.2 & 65.5 & 61.5 & 65.0 & 53.9 & 48.9 & 45.9 & 60.2 \\ Mean north rooms & 40.4 & 46.4 & 50.4 & 56.8 & 64.1 & 55.8 & 52.2 & 52.9 & 63.0 & 56.5 & 45.2 & 42.2 & 52.2 \\ Mean indoor & 40.7 & 47.0 & 50.4 & 57.0 & 64.1 & 55.6 & 52.0 & 52.9 & 63.7 & 56.9 & 45.5 & 42.6 & 52.4 \\ Diff north–south & \(-\)0.8 & \(-\)1.6 & \(-\)0.2 & \(-\)0.7 & 0.1 & 0.5 & 0.5 & 0.0 & \(-\)2.1 & \(-\)1.2 & \(-\)0.8 & \(-\)1.2 & \(-\)0.6 \\ Diff indoor–basement & \(-\)7.6 & \(-\)6.2 & \(-\)5.0 & \(-\)14.1 & \(-\)17.2 & \(-\)16.6 & \(-\)13.5 & \(-\)8.6 & \(-\)1.3 & 2.9 & \(-\)3.4 & \(-\)3.3 & \(-\)7.8 \\ \hline \end{tabular}
\end{table} 
Table 6: Mean monthly air relative humidity values (%) for interior data loggers and the differences between the interior data loggers. \begin{table}
\begin{tabular}{c c c c c c c c c c c c c} \hline  & & & & & **2020** & & & & & **2021** & **Mean** \\  & **F** & **M** & **A** & **M** & **J** & **J** & **A** & **S** & **O** & **N** & **D** & **J** & **Mean** \\ \hline S1 north indoor & 18.5 & 16.7 & 14.6 & 17.8 & 21.8 & 25.1 & 25.9 & 23.5 & 18.4 & 17.8 & 18.8 & 18.5 & 19.8 \\ S4 north indoor & 18.5 & 17.5 & 15.0 & 18.1 & 21.8 & 25.1 & 25.8 & 23.6 & 18.8 & 18.2 & 18.8 & 18.9 & 20.0 \\ S2 south indoor & 17.9 & 16.4 & 14.7 & 17.9 & 21.9 & 25.3 & 26.0 & 23.5 & 18.2 & 17.6 & 18.3 & 18.0 & 19.6 \\ S3 basement & 13.5 & 14.5 & 13.7 & 15.3 & 17.8 & 21.1 & 22.6 & 22.3 & 20.0 & 16.9 & 15.9 & 15.4 & 17.4 \\ Mean north rooms & 18.5 & 17.1 & 14.8 & 18.0 & 21.8 & 25.1 & 25.8 & 23.6 & 18.6 & 18.0 & 18.8 & 18.7 & 19.9 \\ Mean indoor & 18.3 & 16.9 & 14.7 & 17.9 & 21.8 & 25.2 & 25.9 & 23.5 & 18.5 & 17.8 & 18.6 & 18.5 & 19.8 \\ Diff north–south & 0.6 & 0.6 & 0.1 & 0.1 & \(-\)0.1 & \(-\)0.1 & \(-\)0.2 & 0.0 & 0.3 & 0.4 & 0.5 & 0.7 & 0.3 \\ Diff indoor–basement & 4.8 & 2.4 & 1.0 & 2.6 & 4.1 & 4.1 & 3.,3 & 1.3 & \(-\)1.6 & 0.9 & 2.8 & 3.0 & 2.4 \\ \hline \end{tabular}
\end{table} 
Table 5: Mean monthly air temperature values (\({}^{\circ}\)C) for indoor data loggers and the differences between the interior data loggers. The heating system maintained the relative humidity in optimal condition during winter, but, during very cold conditions outside, the relative humidity decreased below the threshold of 40% which was also detrimental for some cultural artifacts. In turn, the basement humidity was driven by water infiltration from the underground and by the lower temperatures recorded there during the warm season. In these conditions, in June, the relative humidity even exceeded the threshold of 80%, which could have been harmful to some pieces from the rock collection exposed there.