## 4 Conclusions  
The analysis carried out in this paper with the simulation of a room of the National Museum of Ancient Art of Lisbon for 15 European cities with different climatic conditions allowed us to conclude that the energy needs vary strongly with the building location. For the climate control strategy using 20-22 \({}^{\circ}\)C and 50-60% RH, it was concluded that the lowest consumptions were obtained for Oporto and Lisbon with 45 kWh/m\({}^{2}\) and 64 kWh/m\({}^{2}\) per year, respectively, while the highest consumptions were obtained for Oslo and Krakow with 135 kWh/m\({}^{2}\) and 117 kWh/m\({}^{2}\), respectively. It was also found that the distribution of energy needs varied strongly. For Lisbon, Seville and Athens, the cooling needs accounted for more than half of total consumption, while for Oporto, Madrid and Rome a balanced distribution was obtained. For the remaining cities, the heating needs accounted for more than half of the total energy consumed. From a thermal rehabilitation point of view, it was found that the greatest losses occur through windows, while, for example, the losses by the opaque envelope are practically negligible for the southern European cities. Thus, the impossibility of standardizing the rehabilitation solutions was concluded, since the building response is widely influenced by the local weather conditions. This evidence led to a sensitivity study to improve the energy consumption for the building located in Lisbon, considering the improvement of the windows and the opaque envelope for two climate control strategies. For the set-point 20-22 \({}^{\circ}\)C and 50-60% RH, the best results were obtained for a solution combining a U-value equal to 0.30 W/m\({}^{2}\).\({}^{\circ}\)C, a U\({}_{w}\)-value of 1.53 W/m\({}^{2}\).\({}^{\circ}\)C and an SHGC equal to 0.10, resulting in savings of 44%. Considering the hypothesis of changing the climate control strategy, the combination of the set-point 16(18)-25 \({}^{\circ}\)C and 40-60% RH with a U-value of 0.30 W/m\({}^{2}\).\({}^{\circ}\)C, a U\({}_{w}\)-value of 2.08 W/m\({}^{2}\).\({}^{\circ}\)C and a SHGC of 0.10 allowed a reduction of 75.3% referring the base model. Significant findings have been obtained that can contribute to the sustainable management of the cultural heritage of southern European countries in the future. It was \begin{table}
\begin{tabular}{c c c} \hline \hline \multirow{2}{*}{**Optimizing Parameters**} & \multicolumn{2}{c}{**Optimal Values/Energy Savings**} \\ \cline{2-3}  & **20–22 \({}^{\circ}\)C; 50–60\% RH** & **16(18)–25 \({}^{\circ}\)C; 40–60\% RH** \\ \hline Climate control strategy & - & 52\% \\ \hline U & (U = 0.30 W/m\({}^{2}\).\({}^{\circ}\)C) & (U = 1.36 W/m\({}^{2}\).\({}^{\circ}\)C) \\  & 5.4\% & 52\% \\ \hline U\({}_{w}\) & (U\({}_{w}\) = 2.34 W/m\({}^{2}\).\({}^{\circ}\)C) & (U\({}_{w}\) = 5.85 W/m\({}^{2}\).\({}^{\circ}\)C) \\  & 1.2\% & 53.8\% \\ \hline SHGC & (SHGC = 0.1) & (SHGC = 0.1) \\  & 21.9\% & 69.6\% \\ \hline U + U\({}_{w}\) & (U = 0.3 W/m\({}^{2}\).\({}^{\circ}\)C; U\({}_{w}\) = 3.32 W/m\({}^{2}\).\({}^{\circ}\)C) & (U = 0.3 W/m\({}^{2}\).\({}^{\circ}\)C; U\({}_{w}\) = 6.01 W/m\({}^{2}\).\({}^{\circ}\)C) \\  & 5.5\% & 56.3\% \\ \hline U + SHGC & (U = 0.3 W/m\({}^{2}\).\({}^{\circ}\)C; SHGC = 0.10) & (U = 0.3 W/m\({}^{2}\).\({}^{\circ}\)C; SHGC = 0.10) \\  & 35.3\% & 74\% \\ \hline U\({}_{w}\) + SHGC & (U\({}_{w}\) = 1.53 W/m\({}^{2}\).\({}^{\circ}\)C; SHGC = 0.10) & (U\({}_{w}\) = 1.53 W/m\({}^{2}\).\({}^{\circ}\)C; SHGC = 0.10) \\  & 33\% & 72.8\% \\ \hline U + U\({}_{w}\) + SHGC & (U = 0.3 W/m\({}^{2}\).\({}^{\circ}\)C; U\({}_{w}\) = 1.53 W/m\({}^{2}\).\({}^{\circ}\)C; SHGC = 0.10) & (U = 0.3 W/m\({}^{2}\).\({}^{\circ}\)C; U\({}_{w}\) = 2.08 W/m\({}^{2}\).\({}^{\circ}\)C; SHGC = 0.10) \\  & 44\% & 75.3\% \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Optimal solutions and energy savings. concluded that \"more\" is not always \"better\". That is, the application of the most advanced rehabilitation solutions may not present a result that justifies their application.