It won't stop running on high when on auto setting. I wouldn't have bought an auto unit if I wanted that. I've changed the filter and held the power button down for 15 seconds, like the instructions say, several times, and it'll run at low speed while on the auto setting for a few minutes, but then it ramps up to high again and never goes down. Our smaller Blue model can sit in the same place, on the auto setting, and never go up to high, but apparently this 211 Auto has no chill and has to be running at high speed no matter what. Lame.