The refurbishment of existing buildings is often considered a way to reduce energy use and CO₂ emissions in the building stock. This study analyses the primary energy and CO₂ impact of refurbishing a multi-family house with different refurbishment packages, given various district heating systems. Four models of typical district heating systems were defined to represent the Swedish district heating sector. The refurbishment packages were chosen to represent typical, yet innovative ways to improve the energy efficiency and indoor climate of a multi-family house. The study was made from a system perspective, including the valuation of changes in electricity use on the margin. The results show a significant difference in primary energy use for the different refurbishment packages, depending on both the package itself as well as the type of district heating system. While the packages with heat pumps had the lowest final energy use per m² of floor area, air heat recovery proved to reduce primary energy use and emissions of CO₂-equivalents more, independent of the type of district heating system, as it leads to a smaller increase in electricity use.

现有建筑物的翻新通常被认为是减少建筑物库存中的能源使用和CO ₂排放的一种方法。这项研究分析了一次能源和CO ₂在给定各种区域供暖系统的情况下，翻新带有不同翻新套餐的多户住宅的影响。定义了四种典型的区域供热系统模型来代表瑞典的区域供热部门。选择翻新包是代表典型但创新的方法来提高多户住宅的能源效率和室内气候。该研究是从系统角度进行的，包括边际用电量变化的评估。结果表明，取决于包装本身以及区域供热系统的类型，不同的翻新包装在一次能源使用上存在显着差异。带热泵的包装每m ^2的最终能耗最低相对于建筑面积，空气热能回收可以减少一次能源的使用，并减少更多的CO _2-当量，而与区域供热系统的类型无关，因为它导致用电量的增加较小。