Environmental sustainability has become one of the biggest problems facing the energy sector today. In developed countries, the building sector represents 40% of the total primary energy demand which in most cases is still supplied mainly with conventional energy sources. Therefore, implementing energy efficiency measures combined with energy systems renewable is a major priority to decarbonize the economy. Interest in air conditioning systems has increased globally, as such systems have the potential to reduce greenhouse gas emissions, use fossil fuels, and improve energy security. Hybrid systems composed of renewable sources plus conventional systems focused on air conditioning, do not provide sufficient benefits. However, 100% renewable hybrid systems that replace traditional air conditioning systems have great environmental, social, and economic advantages and also overcome the barrier of intermittence of renewable energy sources. In this area, this work presents a review of the state of the art of specific renewable hybrid systems for air conditioning. It analyses the sources of renewable origin that are most used, the optimization models, storage methods, and type of systems: isolated or connected to the network.2021-2
