Due to different latitudes and variation of altitude in geographical areas in Iran, the climatic conditions of Iran are such that the variations of the heating degree-days (HDD) are in a broad range of 60 to 3000 for residential buildings in different climatic regions. In addition, in many cases, the building design and construction processes follow patterns which do not necessarily meet national energy requirements and standards. Based on these two reasons, it is essential to identify the current status of energy consumption indicators in residential buildings. That way, it gets more convenient to adopt new strategies to improve the current state of energy consumption of buildings. In this study, heating energy consumption indices of residential buildings is investigated. Using the combination of the results of statistical data analysis, questionnaires, filled in for 500 buildings, and a reference building simulation in different climates of Iran, the heating atlas of residential buildings was prepared. According to the results, the average heating energy index (HEI) of buildings in Iran can be less than 1 to more than 41.3 (m³(N.G)/(m²·yr)) depending on climatic conditions and building design and construction quality. However, in the coldest center of province, the average of this index is 26.3 (m³(N.G)/(m²·yr)) in the hottest one that is equal 2.2. The variations of the thermal base load (supply of hot water) varied from less than 13.12 to more than 378.84 (m³(N.G)/(person·yr)). In provincial capitals, the lowest thermal base load index (TBLI) of buildings is 24.78 and the highest is 226.49 (m³(N.G)/(person·yr)). In this paper, beside charts and tables, results of heating energy consumption indices are also presented in the form of graphical atlases, i.e. color contour plots, to deliver a better picture of the whole country.

由于伊朗地理区域的纬度和海拔高度不同，伊朗的气候条件使得不同气候区域的住宅建筑的采暖度日数（HDD）的变化范围在60到3000之间。另外，在许多情况下，建筑设计和施工过程遵循的模式不一定符合国家的能源要求和标准。基于这两个原因，确定住宅建筑能耗指标的当前状态至关重要。这样，采用新策略来改善建筑物的能耗状态变得更加方便。在这项研究中，调查了住宅建筑的热能消耗指数。结合统计数据分析的结果，填写了500座建筑物的问卷，并在伊朗不同气候条件下进行了参考建筑物模拟，准备了住宅建筑物的加热图集。根据结果​​，伊朗建筑物的平均热能指数（HEI）可以小于1至大于41.3（m³（NG）/（m ² ·yr）），具体取决于气候条件以及建筑设计和施工质量。但是，在最冷的省份中心，该指数的平均值在最热的2.2指数下为26.3（m ³（NG）/（m ² ·yr））。基本热负荷（热水供应）的变化范围从小于13.12到大于378.84（m ³（NG）/（person·yr））。在省会城市，建筑物的最低热基础负荷指数（TBLI）为24.78，最高为226.49（m ³（NG）/（person·yr））。在本文中，除了图表之外，还以图形地图集（即颜色等高线图）的形式显示了供暖能耗指数的结果，以提供更好的全国情况。