如果使用高效的供暖系统，并优化建筑和供暖装置之间的相互作用，可以显著降低能耗。国家建筑规范将以系统方法评估建筑物和供暖系统的质量，并考虑到相互作用。欧洲标准化确定了计算能源性能的可靠方法的必要性。有关供暖系统的工作由CEN TC 228（建筑物供暖系统）WG4（计算方法）完成。标准prEN 14 35，系统能量需求和系统效率的计算方法，考虑了排放、分配、储存、热量产生和控制的损失。能源需求被转换为一次能源。 计算这些损失的基础是根据prEN 13 790《供暖用能计算》确定的建筑用热。这种综合方法可以作为欧洲成员国采用的能源绩效标准的基础。如果没有可用的欧洲方法，则国家建筑规范的规范有可能成为整个欧洲产品的新贸易壁垒。单位:SICitation:研讨会，ASHRAE交易，第108卷，第页。2.

The energy consumption can be reduced significantly if efficient heating systems are used and if the interaction between the building and the heating installation is optimized.National building codes will evaluate the quality of the building and the heating system in a system approach, taking into account the interaction.European standardization identified the need for a reliable method for calculation of the energy performance. The work concerning the heating system is done by CEN TC 228 (heating systems in buildings)WG4 (calculation methods).Standard prEN 14 35, Method for Calculation of System Energy Requirements and System Efficiencies, takes into account the losses of emission, distribution, storage, heat generation, and control. The energy requirements are converted to primary energy. The basis of the calculation of these losses is the building heat use determined according to prEN 13 790, Calculation of Energy Use for Heating.This integrated methodology could be the basis for energy performance standards adopted by the European Member States.If no European method is available, there is a risk that the specifications of national building codes will become new trading barriers for products throughout Europe.Units: SI