An efficient way to reduce the energy required for conditioning buildings and therefore to reduce CO₂ emission is the use of proper thermal insulation in buildings’ external walls. This measure requires data from metrological stations that can be used in the optimization of the thermal insulation. The main objectives of this study are to construct thermal climatic zones for Libya and to specify the optimum insulation thickness for external walls for the different zones. This work is comprehensive as the metrological data from all existing 33 weather stations has been collected and used for identifying thermal zones. For the optimization of the construction of external walls, the most commonly used local wall structures are investigated: hollow concrete block, limestone block and hollow brick. In addition, four thermal insulation materials: extruded polystyrene, expanded polystyrene, rock wool and foamed polyurethane are used with every wall type. Optimum insulation thickness, energy savings, energy cost and payback periods were estimated for the 33 locations using life cycle cost analysis. A map is constructed for the thermal zones based on degree-day values for the entire country. The results show that limestone blocks with expanded polystyrene insulation form the optimum wall construction as it provides the minimum total cost for all locations. Depending on the Degree-day values, the optimum insulation thickness varies between 5.4 and 15.3 cm across the country with energy saving varies between 28 and 178 $/m². Using the optimum thickness, the average CO₂ emissions can potentially be reduced by about 85%. Finally, a contour map represents the optimum thickness of expanded polystyrene is presented in this work.

减少调节建筑物所需能源并因此减少CO _{2的有效方法}排放是在建筑物的外墙上使用适当的隔热材料。该措施需要来自计量站的数据，这些数据可用于优化隔热效果。这项研究的主要目标是为利比亚建造热气候带，并为不同区域的外墙指定最佳的隔热厚度。这项工作是全面的，因为已经收集了来自所有现有33个气象站的计量数据，并将其用于识别热区。为了优化外墙的结构，研究了最常用的局部墙结构：空心混凝土砌块，石灰石砌块和空心砖。此外，每种墙体都使用四种隔热材料：挤出聚苯乙烯，膨胀聚苯乙烯，岩棉和泡沫聚氨酯。使用生命周期成本分析估算了33个地点的最佳绝缘厚度，节能，能源成本和投资回收期。根据整个国家的度日值为热区绘制地图。结果表明，采用发泡聚苯乙烯保温材料的石灰石砌块形成了最佳的墙体结构，因为它为所有位置提供了最低的总成本。根据度数值，全国的最佳绝缘厚度在5.4到15.3 cm之间变化，节能量在28到178 $ / m之间变化 结果表明，采用发泡聚苯乙烯保温材料的石灰石砌块形成了最佳的墙体结构，因为它为所有位置提供了最低的总成本。根据度数值，全国的最佳绝缘厚度在5.4到15.3 cm之间变化，节能量在28到178 $ / m之间变化 结果表明，采用发泡聚苯乙烯保温材料的石灰石砌块形成了最佳的墙体结构，因为它为所有位置提供了最低的总成本。根据度数值，全国的最佳绝缘厚度在5.4到15.3 cm之间变化，节能量在28到178 $ / m之间变化²。使用最佳厚度，可以将平均CO ₂排放量降低约85％。最后，等高线图代表了发泡聚苯乙烯的最佳厚度。