I really wanted to make a note of this as well before I forget.
I took great pleasure in the placement of a humidifier over an air vent in the floor. Being winter, and much of our heat coming from the wood stove, our air is really dry. When I remember, I try to run a humidifier so we’re mostly comfortable and don’t wake up in the morning with cotton mouth.
Our humidifier can run on high, but should really be placed on some elevated surface so moisture doesn’t accumulate on the ground. The general rule of thumb is that if you turn it up high enough that the water vapor starts to drop back towards the ground, it’s up too high.
The only place in the bedroom that would work is the ironing board, and no one wants to keep that out all the time, so it usually sits on the floor. This mostly means that we can’t crank it up as high as it can go, and we get less moisture in the air than we otherwise could.
Today, I placed it right next to the air vent in the floor which lets the dry air from the wood stove come up into the bedroom. I was able to turn the humidifier all the way up and watch the vapor flow up into the air. These little synergies give me great pleasure.