We spend more time at home, so it will become more important with a comfortable indoor climate. But do not fall into the pitfall to close the ventilation in the belief that it will become warmer. The only thing that happens is that the air in the apartment are poor and you're getting into unwelcome smells from neighbors who´s cooking.
You find more tips by clicking on "General information" and "Do-it-yourself" in the menu to the left.
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