1. Auto restart function

2. In heat mode, defrost according to temperature difference of inlet and outlet air

3. Out-door fan controlled by a standalone output to make defrost effect well

4. 3 minutes protecting delay to restart compressor

5. Mode: auto, cool, dry, fan and heat

6. FAN: high, medium and low

7. Avoid cold wind in heat mode

8. Two temperature sensors

9. Wind direction control

10. Emergent on/off key

11. Timer inline/offline

12. Sleep