So the temperatures has indeed fallen and, contrary to what my European / American friends may think, 17°C in HK does feel pretty chilly when you're acclimatised to 30°C+ temps from only a matter of weeks ago.
I'm sure I'm not the first and won't be the last to wonder - WHY THE HELL IS THE AIR CON UP SO HIGH IN BUILDINGS?!?! The temperature inside feels at least 5°C cooler than outside, and people have resorted to pulling out their ski jackets and winter (fake) down jackets to combat the old INSIDE!
I know some locals say "because we need it on to keep the air circulation fresh" (the ignorance of that statement is just crazy when you consider the actual science of what's going on). However, in all fairness, I think what people are really referring to (without realising it) is humidity. So the key is to get dehumidifiers running during the late autumn / winter in HK in lieu of air con when the temp drops and the damp humidity rises, and then everyone is happy.
Who's with me on this? Let's start a revolution! Or at least let's rant about it...