Improving energy performance and reducing greenhouse gas emissions in the city of Petrila in order to combat climate change. After the thermal rehabilitation of the residential building, namely bl. 35 of str. 8 March, jud. Hunedoara will reduce greenhouse gas emissions, which will reduce the effects of climate change and protect the environment, as these types of buildings are responsible for a large part of final energy consumption and CO2 emissions. It will also reduce energy consumption in the building. There will also be an increase in the production capacity of electricity from renewable sources.