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National Laboratory is an equal opportunity employer.Thanks are due to Gabrielle Dreyfus, US Department of Energy, for her support, guidance and helpful review, to Ari Reeves, and Amit Khare, CLASP, for their review and comments, the Room Air Conditioners Manufacturers Association (RAMA) for generously providing much of the underlying data and also their review and comments, Rajeev Ralhan, Price Waterhouse Coopers (PWC) for collecting the cost data underlying this analysis, Anna Spurlock, and Alex Lekov, LBNL for their review and comments and finally to Julie Glover and Heather Thomson for helping with administration and final publication. Any errors and omissions are the authors' own.

Chillers are the key energy‐consuming piece of equipment in most large space cooling systems. They can account for more than 40% of total energy consumption in any typical commercial building and in specific industrial building installations depending on the product and process. With climate change driving rapidly rising demand for commercial and industrial cooling, especially in emerging economies, energy efficiency policies for chillers are crucial to moderate future electricity demand and thereby minimize greenhouse gas emissions. However, most developing and emerging economies lack energy efficiency policies for this significant and growing cooling equipment sector. India recently announced new energy efficiency policies for chillers, projected to avoid 28 TWh of electricity consumption and 23 million tons of CO2 emissions cumulatively through 2030. This article presents a case study of the unique challenges and solutions required to design a new energy efficiency policy for chillers in India. First, the energy consumed in chiller systems is sensitive to building occupancy, load changes, seasonal variations, operation and maintenance, and climatic conditions. In order to address these sensitivities, the chiller testing standard in India factors local weather and temperature conditions into energy performance ratings to account for these sensitivities. Further, every large chiller is a customized product, therefore developing a viable policy and implementation process required collaboration with international and national experts in standardization, manufacturers, building consultants, and testing laboratories. This article is categorized under: Energy Efficiency > Economics and Policy Solar Energy: Thermal ‐‐> Climate and Environment

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