Phalaenopsis and humidity

[EmeraldMistress]

I know that aerial roots form in order to suck moisture from the air. My phalaenopsis do not have any aerial roots; when a root formed last spring from the middle of the stem, it grew strait out for a bit and then headed down towards the medium. So I can gather that my house is probably just not humid enough to warrant the plants growing aerial roots. Is that ok? Is that a bad sign, should I look into a humidifier for the room I grow them in? Oh! And while I have you here, when I was first growing I thought I read that they wanted a north facing window, but I recently read on here that they want an east facing window? Can someone clarify which one they want, and how important it is? Unfortunately I don’t have a good east facing window I can use :/