Yes, in most homes, ventilation grilles should remain open all year round, even in winter. A grille is not intended to be something you turn "on or off" depending on the season, but rather a permanent, small opening that continuously provides fresh air. Nevertheless, many people close their grilles during the colder months, thinking that this will save on heating costs. This often has the opposite effect.
Why closing grilles is a bad idea
A ventilation grille lets in only a limited amount of air, far less than an open window. The heat loss caused by this is relatively small. If you close the grille, the main route for moisture, CO2 and odours to escape is lost. As a result, humidity in the home increases, windows fog up sooner and the risk of mould formation, for example behind cabinets or in corners, increases. Especially in winter, when there is a lot of heating and less ventilation occurs naturally through open windows, a properly functioning grille is important.
When can temporary reduced ventilation be considered?
There are a few exceptional situations in which you can temporarily restrict the airflow through a grille, without closing it completely:
- During severe storms or extreme wind, when a grille causes disruptive drafts or noise.
- With a freestanding, properly functioning mechanical ventilation system that already provides sufficient fresh air, in consultation with the supplier or installer of that system.
Even then, closing it completely and for an extended period is not recommended. A grille on the lowest setting, if that option is available, is often a better compromise than closing it completely.
Signs that your grille has been closed for too long
Fogged-up windows in the morning, a musty smell upon returning home, or visible damp patches are signs that the ventilation has not been sufficient. In that case, check whether all grilles are actually open and have not accidentally been taped over, painted or blocked by furniture and curtains.
Maintenance of grilles
Over time, grilles become clogged with dust and lint, reducing airflow without you having closed the grille yourself. Therefore, clean grilles a few times a year with a vacuum cleaner or damp cloth, so they continue to work optimally.
Frequently asked questions
Do I really save on heating costs by closing grilles?
The effect on your energy bill is usually small, while the risk of moisture and mould actually increases. Most housing experts therefore advise against this.
What if my grille is stuck or no longer works?
Have a jammed or defective grille replaced or repaired. A grille that can no longer be opened causes the same problems as a grille that you keep closed yourself.
Healthy, drier indoor air starts with good ventilation. Do you also want to address moisture or overly dry air in a specific room? Then check out the products from Dynter for a more pleasant indoor climate.