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The paper proposes a solution for the modernization of boiler houses. With the help of equipment for pre-mixing air and natural gas, it is possible to ensure a more complete combustion of the fuel. A description of the basic scheme of mixing natural gas with atmospheric air is given. The influence of this decision on the economic and environmental parameters of the boiler house is shown. The results of experimental studies of the proposed solution, which were obtained at a district boiler house with installed boilers of the DKVr-10-13GM brand, are presented. The results obtained show that the use of the technology of feeding a pre-prepared gas-air mixture into the burners allows reducing the underburning of fuel and the concentration of carbon monoxide (CO) in the combustion products. At the same time, there was a decrease in the specific consumption of natural gas for heat generation from 133.3 m3/Gcal to 130.3 m3/Gcal with significant savings in cash. Other advantages of this solution are also observed: an increase in the radiation and a decrease in the convective component of the heat transfer process from the flare and exhaust gases; reducing the temperature of the exhaust gases; reducing the emission of harmful components into the atmosphere; increasing the efficiency of the boiler. [ABSTRACT FROM AUTHOR]