## 3 Results and Discussion
### Envelope Performance According to RTQ-R  
The CDH performance behavior differs from that observed in energy demand. When operating with an HVAC conditioning system, the thermal exchanges caused by the winds, that may affect the indoor' spaces, are minimized since the windows remain closed and the winds basically remove heat from external facades, entering indoors spaces by fenestrations that exist on the window's panel (Figure 6). For the LIHe typology, the worst average performance is observed when walls are oriented to the north (10,269 \({}^{\circ}\)Ch). In contrast, the best average performance is obtained when the walls are oriented west (9339 \({}^{\circ}\)Ch). In this case, a 9% reduction in the CDH is achieved, being the best orientation for the building without the bermed earth-sheltered wall. Similar to the cooling energy demand, the incorporation of the thermal mass strategy with bermed earth-sheltered walls provides a CDH reduction in bedrooms for all orientations (Figure 6). For LIHb, the worst performance is seen when the bermed earth-sheltered walls are oriented to the north (7585 \({}^{\circ}\)Ch), and the best performance when the walls are oriented to the west (5810 \({}^{\circ}\)Ch, 23.4% reduction). Regarding the performance of the CDH, the same design recommendation for the orientation of the thermal mass strategy for buildings without the tested strategy should be followed for the building with the bermed earth-sheltered wall. CDH reduction is expressive, varying from 26% to 38%, as much as those observed in the previous cooling demand analysis. For the LIH implanted in Salvador city, the combined adaptation measures in the current climate resulted in decreasing in cooling degree-hours ranging between 33% to 68%, compared to the standard LIH, reaching CDH varying between higher than 5000 \({}^{\circ}\)Ch and lower than 12,000 \({}^{\circ}\)Ch [12]. Notice that LIHe typology presented level \"A\" energy efficiency rating (CDH \(\leq\) 12,566 \({}^{\circ}\)Ch) in all orientations evaluated in the base scenario, as well as LIHb which had its envelope improved with the implementation of the partially-bermed earth-sheltered walls. The raising of the air temperature, due to climatic conditions that may prevail in future periods due to climate change, will progressively impact the possibility of transferring heat  
Figure 6: Weighted annual average cooling-degree hours (CDH) indicator in baseline and future scenarios (colors in west orientation for LIHb in the 2050s was changed to match with the colors established in the RTQ-R). from the indoors to the outdoors environments, reducing the potential use of naturally ventilated strategy in the residential buildings. In the 2020 scenario, an increase in the CDH inside LIHe rooms (18% to 30%) was observed, with the best performance strategy orientation (west) in the base scenario being the most impacted due to global warming effects. In the LIHb, the scenario was even more drastic, with CDH doubling (reduction from 61% to 111%). In the 2050 scenario, the CDH exceeded double in some orientations, when compared to the base scenario, for both LIHe (148% to 173%) and LIHb (227% to 327%) (Figure 6). The impact in the CDH may be assigned to the predicted increasing of the outdoor air environment (projected rising of 1.5 \({}^{\circ}\)C and 3.3 \({}^{\circ}\)C for 2020 and 2050, respectively) and reduction in the humidity, but also due to the elevation of global horizontal radiation. In turn, the rising in ground temperature (see Table 4) also corroborates degeneration of the building's thermal performance [9; 13].