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The issues of increasing the energy efficiency of blast-furnace blast heating by increasing the temperature under the cowper and reducing the specific consumption of natural gas by heating the combustion components and increasing the blast temperature are considered. The aim of the study is to increase the efficiency of fuel combustion, save natural gas, determine the technical feasibility and thermal efficiency of heat exchangers at different flow rates of natural gas for burners and complete combustion of blast-furnace gas with a minimum excess air coefficient to achieve the specified technical and economic indicators of the furnace. In order to increase the efficiency of fuel combustion, determine the technical feasibility and efficiency of blast furnaces while ensuring complete combustion of blast furnace gas with a maximum calorific value to achieve the specified technical and economic indicators of blast furnace air heaters, it is proposed to install heat exchangers for heating air and blast furnace gas with hot flue gas waste. Achieving this goal is quite justified, since with the help of the calculated economic effect, it is possible to optimize the operation of air heaters and improve the efficiency of fuel combustion by installing a heat exchanger for heating blast furnace gases and combustion air. It is proposed to install additional equipment of heat exchangers to increase the temperature of the hot blast during the cycle of supplying it to the air heater system. The study and improvement of the thermal operation of blast furnace air heaters is presented, which makes it possible to reduce the consumption of natural gas. Increasing the energy efficiency of blast furnace production leads to a reduction in the cost of pig iron production and an increase in the competitiveness of finished metallurgical products.