On the other hand, aeration does not mean leaving the window slightly open all day while turning the heater to the maximum. Of course, the fresh air would be guaranteed, but on the contrary, the constant supply of outside air would not only cool the indoor air but also the walls, thus putting the heater in overtime job. It is recommended to ventilate 2 or 3 times a day for 5 to 10 minutes. In this way, fresh air quickly replaces the stale air without cooling the walls.
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Ventilating is essential for indoor air quality as well as for saving energy. This ensures a fresh air supply while limiting the cooling of the walls, which makes it possible to quickly restore a pleasant temperature after aeration. It is also advisable to decrease the thermostat at the time of aeration. This makes possible to avoid the tripping of the radiator near the windows.
It is inappropriate to use the inclined/oscillating position of windows in winter. The air exchange is insufficient and it cools the walls. A window kept in constant oscillating position can increase the consumption of fuel oil by 200 liters (Source: wwz.ch)
Targeted aeration in winter also regulates moisture in the dwelling. The removal of moist air is essential, in order to limit the growth of mold and the proliferation of mites. The ideal relative humidity is between 30% and 50%.
Additional tips and tricks
- Combining the correct ventilation and optimum temperature ensure internal well-being while reducing energy consumption.
- In highly insulated or newly renovated dwellings with high tightness, manually aerating is particularly desirable, except of course if an automated aeration system has been installed.
- The person who renovates his home, insulates his facade, replaces the windows and installs and environmentally friendly heating system, saves a lot of energy.