Under normal circumstances, an installer will contact the user to make an appointment to install the air conditioner at home within 2 ~ 3 days after the air conditioner is delivered to the door. However, it does not rule out that in the peak season of air-conditioning sales, manufacturers or merchants have a large amount of air-conditioning installation work and insufficient arrangements, which leads to a long time. It is recommended to call the after-sales service phone of air conditioner manufacturers and merchants at the same time to make an appointment for installation time, and the air conditioner installation will be completed first.