This analysis was conducted to verify the feasibility of transforming the district heating sector in Poland as assumed in the “Fit for 55” package. The district heating sector in Poland has unique characteristics and importance compared to other European Union member states. The current situation of the district heating sector in Poland, along with climatic conditions, is detailed below. At the same time, available technologies and fuels for transforming the district heating sector were identified. The above facts were taken into account in the conducted study of the possibility of complying with the most relevant requirements under the proposed EU legislation, in particular the draft EED, RED III and EPBD directives. The answer to the question of the possibility of transforming the district heating sector in Poland comes from the results of economic model calculations. The use of market-based, economic data and technological characteristics of the study provided a key answer about the feasibility of adaptation to the requirements of the “Fit for 55” package and an estimate of the cost of transformation. Based on a detailed analysis on systems of different sizes, key conclusions and recommendations for further legislative action were drawn.