The main vector of novel coronavirus is air. Although novel coronavirus has not been detected in air conditioners, there have been examples of central air conditioners causing the spread of infectious diseases during previous outbreaks, and the range of droplet activity increases significantly when the central air conditioner is in working condition. During an outbreak, use should be stopped and the central air conditioning system and the entire environment should be disinfected. After the epidemic has completely stopped, and after assessment and qualification, see whether to turn on the central air conditioner again according to the actual situation.