I remember when I was a child: my grandparents used a very simple humidifier attached to the heating in each room [1]; I'm not sure how effective these are, but

I remember when I was a child: my grandparents used a very simple humidifier attached to the heating in each room [1]; I'm not sure how effective these are, but I guess they don't require any real maintenance. ;) [1] http://bilder.zuhause.de/b/66/73/47/12/id_66734712/tid_da/schmale-luftbefeuchter-fuer-die-heizung-verdunsten-eher-wenig-wasser-.jpg http://bilder.zuhause.de/b/66/73/47/12/id_66734712/tid_da/sc...