With my model, I can't detect any humming or buzzing noise on level 1. The Dyson is almost silent. From level 2, I also hear the draught, as you described.
It is only a fan with an air purification function, which means that the unit must run at least on level 1 for it to purify the air, the air is not cooled in that sense. For detailed information, I recommend that you ask Dyson directly.
Hello
I don't think so, as the associated remote control can only control settings such as switching on and off, the strength of the airflow and the rotation, to be honest, never needed anything else either, which is why I never thought about linking to it. So I can't say, I googled for it briefly and found nothing in a hurry, but I'm sure the manufacturer can help.