Humidifier Question - New Haven,CT

There are various kinds (3 that I know of) that each have pros and cons.
1) The cool mist cannot burn kid fingers since the vapor is cool but germs can grow so they require frequent cleaning and disinfecting. If it is the kind with a "sponge" that soaks up the water and a fan that moves over the sponge, then you need disinfectant in the water or the sponge will be a breeding place for germs and mold. I believe there is also an additive you can buy to put in the water to retard mold growth.The sponge kind forces air over the moisture and the good thing is that air will only absorb however much moisture it can hold and not get over saturated.
2) If it is the cool mist ultrasonic kind where water goes over a little round metal cup and gets vaporized by the ultrasound, then the ultrasound cup can stop working if you have hard water as the minerals in the water deposit into this cup as the actual H2O evaporates. You will have to clean the ultrasound cup daily if you have hard water. Also, the vapor will be cool - good for little fingers but bad since it allows germs to grow in the water and on the ultrasound cup.
3) The steam ones can burn little fingers with the boiling steam coming out but because they boil the water there is no germ or mold problem in the humidifier itself. The bad thing about steam ones is that they force moisture into the air so your room may end up like a moist tropical forest causing mold to grow on windows or walls. To avoid this, we have the steam ones on a timer and I have them "on" for about 2 hours as we go to sleep, then the timer turns them off for and back on from about 4-6 AM. I also check the cooler windows and wipe any moisture from the windows every morning so no mold grows there.

Yes, it's mistless. I have one like this. I looked the model up online and that is what it said. I had forgot from last winter and wondered my there was no steam.

It sounds like the humidifier is not large enough for the room and therefore is running out of water.

Is it a cool mist humidifier that disperses the mist with a fan? We tried one of those and it did make the room much colder. I returned it and instead we use an ultrasonic cool mist.

The first one I eve bought didn't make a visible mist. But it too cooled the room.
I actually think it was a BETTER humidifier than the ones I bought subsequently. Rather than having a removable plastic tank that you fill and then stack on top of the actual machine, it WAS a big tank, that you sat a lid with the fan in it on top. It had a big rubbery filter/wick thing that you slid down into the water and it wicked the moisture up and then the fan (i guess) blew it out into the room. It worked well, and was a lot less noisy than the tank kind I've bought since then, and the furniture didn't get all wet. :))

I'm sure it's working fine.
Just be sure to dry it daily and clean it regularly so you don't get any mold growing in it.

We have cool mist humidifiers put out by Crane (target sells them - we have thomas the tank engine in our son's room and we have a frog in our room). There is a knob to adjust the mist and the instructions tell you to turn it all the way up so you see the mist when you first turn it on, then gradually turn the mist down until it just disappears. If you put the mist up too high the air won't properly absord the moisture, and if its down too low it won't hurt anything but you won't get the full benefit of running it.