High precision microcomputer control temperature and humidity system with PID control The refrigerant flow to make the system's heating /humidification volume reduction, to achieve low power consumption, energy saving, carbon reduction effect, cooling, heating, humidity control intelligent electronic control, long-term stable use. Copper-tube-bending machine applied, nitrogen protective welding, ensuring the clean­ ness of refrigerant system, energy-saving. Electrical control cabinet separated design for ensuring the components longer service time.