Learn relevant professional courses (engineering heat, fluid mechanics, heat transfer, heating technology, heating engineering, refrigeration principle, air conditioning and refrigeration machinery, air conditioning, water supply and drainage engineering design, automatic control of refrigeration and air conditioning, architectural drawing, boiler and boiler equipment, engineering budget, ) Then practice CAD (Hongye, Tianzheng ...) and finally understand the relevant specifications (design specifications for heating, ventilation and air conditioning of civil buildings, civil air defence basement design specifications, design specifications for fire prevention of high-rise civil buildings, design specifications for industrial boiler rooms, public specifications * * * building energy-saving design standards, civil building energy-saving design standards, clean workshop design specifications, boiler room design specifications, Unified Standard for Acceptance of Construction Quality of Building Engineering, Code for Fire Protection Design of Garage, Garage Repair and Parking Lot, Code for Acceptance of Construction Quality of Ventilation and Air Conditioning Engineering, Code for Heating Metering, Technical Code for Radiant Heating ...) HVAC design is awesome, and I hope it can help you.