A company has developed an air-conditioning management system that automatically starts up through a human flow detection system. Turning off the air-conditioning, the application of this system will greatly reduce the power consumption of air-conditioning in the office. But this system has been launched for several years. Not much, sales are not ideal. which is the most reasonable explanation for the above phenomenon? ['The air conditioning management system is welcomed by home users in many cities.', 'The air-conditioning management system is complicated to operate and requires professional staff to operate.', 'Energy-saving air conditioners occupy the mainstream in the market, and air conditioning energy consumption has been greatly reduced compared to the past.', 'Many units have a strong sense of environmental protection and have developed the habit of going out and closing air conditioners.']