The concept of energy efficiency today acquires real meaning on a large scale. In the light of this trend, the number of citizens who want to install heat meters in their apartments is growing. However, the installation of these devices, which is an effective tool for accounting for thermal energy, should be preceded by a real decrease in heat loss. Only in this case, the metering devices will become an effective tool for saving thermal energy for consumers, while without damage to suppliers of this very energy.