The scope of this European standard is To define the procedure how the calculation methods to determine the temperatures, sensible loads and energy demands for the rooms shall be used in the design process. To describe the calculation methods to determine the latent room cooling and heating load, the building heating, cooling, humidification and dehumidification loads and the system heating, cooling, humidification and dehumidification loads. To define the general approach for the calculation of the overall energy performance of buildings with room conditioning systems To describe one or more simplified calculation methods for the system energy requirements of specific system types, based on the building energy demand result from prEN EPBD WI 14 "Thermal Performance of Buildings - Calculation of energy use for space heating and cooling", and to define their field of application. A general framework standard is given which imposes an hourly calculation for all cases which cannot be covered by simplified methods, and gives requirements on what has to be taken into account. Input and output data are defined. The idea followed by this standard is, that for the detailed approach one single calculation method is used for the different room related purposes such as room temperature calculation, room cooling and heating load calculation, and room energy calculation. This means, for the building type envisaged (buildings with room conditioning systems) it is an alternative to simplified calculation methods such as heating load according to EN 12831 and heating energy according to EN 13790. This standard does not describe any detailed methods for the sensible room based calculations. For this it refers to the relevant standards EN 13791 (EPBD WI 27), EN 13792 (EPBD WI 28), prEN EPBD WI 16 "Thermal Performance of Buildings - Calculation of the Energy Demand for Air Conditioned Buildings" and prEN EPBD WI 17 "Thermal Performance of Buildings - Calculation of the Energy Demand for Air Conditioned Buildings". This standard (chapter) specifies simplified methods and describes the necessary functionality of methods for the calculation of standardized annual energy consumption by systems providing temperature control, mechanical ventilation and humidity control in existing and new buildings. For brevity, these are described as HVAC systems. These systems may provide any or all of these services, including heating, cooling, air filtration, humidification or dehumidification. For the ventilation part it refers to prEN EPBD WI 20 "Ventilation for buildings - Calculation methods for energy requirements due to ventilation systems in buildings". Systems providing heating but no other services are covered by EN 14335 and related documents, EPBD WI 7 to 9. The standard specifically relates to demand calculations needed for Energy Performance Rating in connection with the Energy Performance of Buildings Directive. These installations may include: Emitter, distribution, storage and generation for cooling Emitter, distribution and heat exchanger for heating if these functions are performed using an air conditioning system; all heating functions performed by direct heating or using water as a heat transport medium are treated in other standards. The calculation of cooling and heating energy demand within buildings is dealt with by prEN EPBD WI 14 "Thermal Performance of Buildings - Calculation of energy use for space heating and cooling" and is a required input. This standard only addresses these issues to the extent that HVAC systems have an influence on the loads.