Application issues:
1. People are crowded and the air is cloudy. Lack of fresh air is easy to make people feel ill, which increases the risk of disease transmission.
2. Installation of central air conditioning requires a large amount of equipment investment and high operating costs.

Solutions:
1. Installation of "Ciberli" air conditioner can meet the use demand without closing the doors and Windows, which can cool down quickly, replenish fresh air with ventilation, increase air oxygen content, and provide a more comfortable and cool environment.

2. The investment of installing "Sibyl" air conditioner is only 1/4 of that of central air conditioner, which can save more than 80% of operating cost.