The influence of the temperature of the mains water in the supply line on the technical and economic indicators of a heat energy source with an available capacity of 25 GCal/h with a qualitative method of regulating the heat load is evaluated. Three temperature control schedules were selected for comparative analysis: 150/70°, 130/70°, 110/70° without breaks and cuts. For each of the considered temperature graphs, the calculated flow rate of the coolant, the required diameters of pipelines, specific and total pressure losses in the system, the cost of pipelines, pumping equipment and installation work, the total cost of work on laying the turnkey heat network, the loss of thermal energy (power) through the insulation surface, the total annual loss of thermal energy are determined through the insulation surface at different temperature conditions. Based on the results obtained, it was found that the most optimal of the temperature regimes presented in the study is a temperature graph of 150/70°.