This project solves the reduction of heat losses of the backbone distribution of heat transfer medium for heating and hot water heating in the area of Fatra, a.s. Napajedla. Existing distribution systems are oversized to the current consumption of heat and to reduce heat losses, it is not efficient to simply reinsulate the distribution systems. The aim and basic idea of saving this project is to replace the existing heat distribution systems with new ones with a lower dimension of the pipeline and to reduce the temperature of the heat transfer medium.