For those of us who have a split air conditioner unit, where the external compressor is outside the building and not easily accessible (due to being in a high rise):
1. How often does the external compressor need maintenance work? Even as simple as routine cleaning / clearing?
2. How is this done if you live in a high rise?
3. And if the answer to (2) is scaffolding, then why is there not more scaffolding (anecdotally) around in apartment buildings whilst everyone randomly has their air con units serviced or fixed?
I feel like I am missing a secret about air conditioning in apartments in HK here!
Thanks