| Summary: | The Life Cycle Assessment methodology has proven to be effective in evaluating the impacts of goods production throughout their life cycle. While many studies are available on specific products, in recent years a growing interest is related to the analysis of services, including energy supply for final customers. Different LCA evaluations are available for electricity, while the heating and cooling sector has not yet been properly investigated. The objective of this study is the analysis of the specific impacts of the heat supplied to the final users connected to a district heating system, in comparison with traditional individual natural gas boilers, which represent the baseline heating solution in several urban contexts in Europe. The results show that the comparison is heavily dependent on the allocation method used for combined heat and power plant production. District Heating impact on heat supplied to the users can vary from 0.10 to 0.47 kg<inline-formula><math display="inline"><semantics><msub><mrow></mrow><mrow><msub><mi>CO</mi><mn>2</mn></msub><mi>eq</mi></mrow></msub></semantics></math></inline-formula>/kWh, while distributed natural gas boilers present an overall impact equal to 0.27 kg<inline-formula><math display="inline"><semantics><msub><mrow></mrow><mrow><msub><mi>CO</mi><mn>2</mn></msub><mi>eq</mi></mrow></msub></semantics></math></inline-formula>/kWh.
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