「黃家駒 Wong Ka Kui」 | (aka: 鳳凰院 凶真 Hououin Kyouma)How often are your windows open? What about during Winter? or during Summer? Do you open windows to let in fresh air?
fozidDepends on temperature. If it’s below 10C all day, then generally never, maybe every day or 2 for 10 mins to let some fresh air in. 10-15C, probably most rooms on the first latch during the day and most closed at night. Over 15C and windows open mostly including on the latch at night.