In general, probably not bad. Better than without it :) raises from 29% to 44% (on average), with micro-ventilation and no door in the room (16.5 m2). But this is also an indicator in the area of \u200b\u200bthe humidifier itself. You need a separate hygrometer. Summing up, it is a little easier to breathe and cooler in the room, especially if it works at maximum speed. Mucous membranes are not so much fucked up from heating in winter. We were also very surprised by the yellow water in it after two days of work.
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