Thanks for the updates everyone, some rooms do indeed get the blunt of rain or sun or both + temperament in aircon / outdoor temperatures . Interesting about the portable humidifier, i had experienced it once on arrival but in my instance it cleared out when turning the AC completly off, put the ceiling fan on max speed rotation and open all doors/slidingdoors to balcony for a good cross breeze to get odeur and stake air out....
For added effect i was fanning myself too