**Appendix A**

#### *The House under Study*

The house building is double dwelling, connected by internal stairs, as shown in Figure A1 [37]. Each floor has an area of 97 m<sup>2</sup> and a height of 3 m. The ground floor includes an entrance, living room, bedroom, kitchen, and bathroom. The first floor contains the master room, bedrooms, and bathroom. The wall layer details and various construction components of the house are given in Tables A1 and A2.

The maximum total calculated cooling load, according to CARRIER software, is about 25 kW. Figure 4 shows the percentage of the various peak cooling load components estimated by CARRIER software. The load through the walls was 40% of the total cooling load due to the higher temperature difference between outdoor and indoor temperature; the heat envelope transmission aggravates cooling demand. The transmission losses could be reduced significantly with envelope higher thickness insulation. Additionally, ETC collectors mounted on the first floor roof of the house could reduce the cooling load due to shading, though not all are eliminated. The load on the roof is 20% of the overall cooling load. The actual total estimated cooling load would be about 21, which is in alignment with the data obtained in [37].

#### **Table A1.** Wall layers details.



**Table A2.** Construction components of the house.

**Figure A1.** Layout diagram of the modern domestic solar house (**a**) ground floor (**b**) first floor.
