「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?
Vet_VrolijkMy bdroom windows are open almost the time, except when it’s 30+ degrees in summer (to keep the heat out, we close it during the day) or below and -5 in the winter (to keep the heat in, we close it during the night).