Excuse me: how much is it to change the air switch at home?

It depends on the distance between houses. Moreover, if there is a house with a property management office in the community, then replace the air switch, and the property owner is likely to have these supporting maintenance services, that is, collect the door-to-door service fee. If it's a property, it's probably around 30 yuan, so you need to buy your own air switch.

Of course, this is only a general situation, and it depends on the local market situation.