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Financial energetic problems oblige citizens to reduce the energy consumption. Accordingly, the recent research showed that major financial economies can be optimally achieved, by introducing some passive measures. The main objective of the current contribution is to investigate the impact of thermal insulation and compactness on energy efficiency. Following the assessment of the methodology, several input parameters were identified and economic insulation thicknesses were obtained. Finding revealed that the best effectiveness of solar gain has been observed for a better insulation and a good compactness, whereas a reduction of about 12.51% of energy needs can be achieved. Similar to the previous case, compactness has an attractive effect, provided that the building was well insulated. Furthermore, any variance cannot be occurred in economic insulation thickness by varying the building compactness. Unlike this remark, for a better compactness, a slight increase in the investment-return time has been noticed, following the energy bill reduction, which becomes more interesting. Hence, the comparative study averred that the previous passive concepts provide reduction in energy needs nearest 73.64%. Thus, reduction was nexus 82.17%, during cold season, and around 59.87%, in overheating period. As consequence, the studied structure type can be integrated in the buildings that have an energy label of “type C.”

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