I've used a plug in waterfall but it required refilling often in the winter.
My elderly client put a basin of water under her heating unit in her apartment.
I make soup or simmer spices in water on the stove.
You could also try a large vase of water on top of the heating unit or by the vents so it can evaporate.
water bowls at the registers, cool mist humidifier in the bedrooms, open dishwasher and let them airdry, our humidifier on the furnace does not work so well so this is what i do to help. we all have sinus/allergy issues and i find as long as i use clean plastic bowls each day it does help some.
Humidifyer, fish tank, plug in waterfall things, i have a water based room deodorizer thing, it's like a mini crockpot, you fill with water to the line and drop in a few drops of what looks like essential oils or potpourri (i know what it is called, I can't think of the name though, probably something easy.)
When I notice the air is getting too dry, I wet a bath towel at bedtime, wring it out so it isn't drippy, and hang it in the bedroom. As it dries it adds moisture and when it's done, I still have a clean dry towel, if not as fluffy a one.
I've tried humidifiers, but just found them to be too much trouble.
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