The thermal energy supply of private residences was investigated with regar
ds to the Carbondioxide emissions by the Institute of Technical an Environm
ental Chemistry of Jena University. Reasons for this study were basic reorg
anisations in the city's thermal energy supply since 1990. The Carbondioxid
e emissions have been investigated by means of Life Cycle Assessment to eva
luate the heat supply of Jena residences under ecological aspects.