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10Climatic zoning for building energy efficiency applications is an important element in building energy policy and 11 regulations. There are several methodologies available to conduct climatic zoning, providing significantly different results. 12Currently, there are no procedures to assess the validity of a proposed climatic zoning, hindering the decision to use one 13 particular climatic zoning methodology instead of another. This paper introduces a quality index and a procedure to support 14 the validation of climatic zoning. The procedure is based on building performance simulation results concerning the 15 building stock that is targeted in the climatic zoning policy or program. Simulation results are used to calculate a new index, 16the Mean Percentage of Misclassified Areas (MPMA), which assesses the quality of the zoning under analysis. The 17capabilities of this procedure were demonstrated by the evaluation of four alternatives for the climatic zoning of Nicaragua, 18 obtained using different methodologies and previously reported in the literature. The building stock used in this case study 19 is composed of a few archetypes based on typical naturally ventilated dwellings in this country. Simulations were conducted 20 using the program EnergyPlus for a total of 328 locations in Nicaragua. Degree-hours of discomfort based on the adaptive 21 model of ASHRAE Standard 55 were used as a performance indicator. Results indicate that zoning obtained using cluster 22 analysis and cooling degree-days may misclassify 1 out of 5 areas in Nicaragua (MPMA around 18% to 20%). This study 23 concludes that the validation procedure and proposed index are useful for highlighting qualities and deficiencies of existing 24 climatic zoning methods, particularly when these methods are used in less conventional applications, such as for policy 25 making targeting naturally ventilated dwellings in tropical climates. The application of this procedure in more than 50 26 countries which adopt climatic zoning is foreseen as the next step in his area, substantially affecting the prescription of 27 building materials and components worldwide. 28 29

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