The unit has multiple functions such as cooling, heating, ventilation, and automatic operation, which can be set freely and adjusted automatically; The unit can be equipped with auxiliary electric heating to ensure heating effect even in extremely cold weather; The unit adopts exhaust condensation without the need for external units, which can perfectly utilize the heat of exhaust and has a high energy efficiency ratio; The unit adopts a variable frequency compressor, which can automatically reduce the operating frequency of the compressor when the load decreases. The operating power is low, the energy efficiency is high, and it is more energy-efficient; Adopting a microcomputer automatic control system with comprehensive system protection functions, the product is easy to operate and highly reliable; The compressor operates with variable frequency, supplying only cold and heat as needed, avoiding frequent on-off of the compressor, ensuring stable air temperature and better comfort; The unit has a compact structure, small footprint, and easy installation; The core components such as compressors are made of internationally renowned brand products, which are stable, reliable, and durable.