Improving energy performance and reducing greenhouse gas emissions in the city of Petrila in order to combat climate change. After the thermal rehabilitation of bl. 12 of str. 8 March, Petrila city, Cluj county, Romania 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. At the same time, it will also have the effect of reducing the primary energy consumption in the building by 64.97%. There will also be an increase in the production capacity of electricity from renewable sources.