You need to ventilate the premises at least twice a day.
Moreover, proper ventilation is complete ventilation, when the windows are opened wide for a certain time.
Micro-ventilation or an open window alone cannot achieve the desired effect.
Ventilate the room in any weather and several times a day.
In severe frost, the ventilation time should be reduced to 3-5 minutes.
Do not overcool the room and do not leave windows constantly open, because due to hypothermia, condensation may appear on the walls and furniture, and this is one of the causes of mold.
The smaller the room, the more often it is necessary to ventilate.
Here are some tips: do this every hour for 10-15 minutes in the summer, in winter - 3.4 times for 5 minutes.
A modern way to maintain the correct microclimate longer is to use a humidifier.
To quickly ventilate your apartment in winter, just open the window completely for 5-10 minutes.
During this time, cold street air will displace warm indoor air.
After the windows are closed, the air temperature will quickly return to its previous value.