In line with the principle of equivalence, each Member State implements various EN standards into its regulations to assist in the evaluation of the performance of alternative cooling techniques. Examples of such standards are:

·         EN 13790: Energy performance of buildings-Calculation of energy use for space heating and cooling

·         EN 15241: Calculation methods for energy losses due to ventilation and infiltration in commercial buildings

·         EN 15242: Calculation methods for the determination of air flow rates in buildings including infiltration