Exactly, here in Thailand we have AC everywhere, in house, school, work, restaurants, shopping malls, etc.
We were frequently sick before we start masking in 2020, however, last 5 years with PROPER masks and the same AC’s we have almost no infections! 😀😷
it’s ‘i got sick because of the air conditioning’ season!! no you didn’t, you got sick because someone infected you. you can sleep with your fan on all you want, you won’t get sick if you wear a respirator in public spaces.