Cellar air conditioners are precision temperature and humidity control units for low temperatures. They operate on the same principle as standard air conditioners but have their unique characteristics. They use low-temperature compressors because the temperature requirement for cellars is generally between 10℃ and 18℃. Standard air conditioners have an outlet temperature of about 18℃, resulting in an indoor low temperature of around 20℃. Therefore, a low-temperature compressor is necessary for cooling.

The actual refrigeration temperature of the low-temperature compressor is approximately 0℃-20℃; the unit is equipped with a humidifier, typically using both wet film humidification and electrode humidification based on the unit's power. An internal water tank is connected to the humidifier, featuring its own temperature and humidity control system. Additionally, according to the requirements of the wine cellar, the unit will also be equipped with a condensate drainage pump and vibration-proof devices.