The research on the possibilities for the recovery of the process gas (CO) in the hearth of the cupola furnace for the production of cast iron in the "Foundry E & E" in Gjakova on Kosovo, aims to recover the heat, which would be used for preheating the air of which is blown THROUGH blowers for burning coke. Modifications to the technological scheme of the process, in this case, would include recovery of thermal energy, additional preheating of the gas, and dosing of preheated and CO-enriched air into the hearth of the coke-burning furnace. According to the data from our study program, the air recovery and heating system with a closed chimney is one of the most suitable commercial and technological solutions for improving the performance indicators of the technological process, heat preservation, and environmental protection. The research of the possibilities of return, thermal energy recovery, and air preheating for the combustion of coke in the cupola furnace in the "Foundry E&E" smelter is part of the research project "Research of the return gas (CO) through blowers in the scrap melting area in " Foundry E&E" supported by MEST of Kosovo. On the basis of the data from the chemical analysis of the charge components, the granulometric composition of the coke, and the thermal recording of the melting process, the thermal potentials of the physical and chemical heat of the process gases and the heat created by the combustion of the fuel have been identified, as well as The CO/CO2 ratio has been determined. While, according to the quantitative and qualitative methods of the charge and process products, we have determined the temperature according to the areas in the furnace and that of the exhaust gases, and based on the measurements we have proposed that the air return, recovery and preheating system for burning yogurt in cupola furnace is one of the most favorable commercial and economic options for application in the cupola furnace in the "Foundry E& E" in Gjakova on Kosovo. The system of energy recovery, preheating, and air enrichment in the oven with a closed chimney is security not only for the improvement of key performance indicators but at the same time it would enable energy saving, process control, product quality management, reduce production costs, and minimization of gas emissions in the atmosphere. Energy recovery and recirculation systems for all cupola furnaces in principle are more or less similar to each other, but systems with a closed chimney, have advantages; the return of dust to the process, the maximum recovery of the physical and chemical heat of the process gases, as well as the near-zero minimization of CO2 in the atmosphere.