In the part intended for production, there is underfloor heating and cooling, ventilation of the foundry and other production and storage areas. In this part, the thermal energy recovery system from the production process was also designed and implemented. The primary source of energy is a water-to-water heat pump with a power of 240kW, and we got water from 4 wells over 120m deep with an accumulation of 40+40 cubic meters. A 160kW gas condensing boiler is installed in the power unit.