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A "whole house humidifier / dehumidifier" attached to the HVAC system is, arguably, the best way to go. If you're lucky enough to have a DC motor on the HVAC blower, or can refit your existing unit to a DC motor, you wind up with an exceptional setup. Due to my wife's allergies, we installed a system like this a couple years ago. The blower is set to continually run on "low", keeping the house at a fairly steady-state humidity without risking moisture damage in the walls or attic. The humidifier/dehumidifer and UV/HEPA system run independent of the heater or A/C and with the blower on "low", the house has even distribution of temperature, humidity, and air quality. We don't use "setbacks" at night - they're a good idea in a perfect world, but frankly, in the winter, you end up using more electricity or fuel to get the home back up to temperature than keeping a steady temp. Also, since humidity is relative to temperature, you end up with a cold temp/high humidity scenario using setbacks.
Some of the other benefits; humidity or drip trays work more efficiently to set up a microclimate, the continual movement (and filtration) of air wards off bothersome things like powdery mildew, and creates unfavorable conditions for some pests, like spider mites. ... On the downside, mealy bugs and fungus gnats are downright happy. Yellow (or blue) sticky 'pest traps" work well to break the fungus gnat cycle, while the periodic application of Isotox (liquid) or Di-Syston (granular) (I make a solution after powdering the granules - just be sure to wear some sort of breathing filter and do the crushing in a garage or other outdoor space with a mortar and pestle) takes care of pretty much anything else that contemplates taking up residency like scale, aphids, thrips, springtails, yadda, yadda, yadda.
I typically mist three or four times/day, but that's largely for the benefit of the true tropicals - Ficus, Sagetria. The semi-tropicals aren't complaining either (dwarf crape myrtle & dwarf pomegranate - both of which get a rest period from leaf-fall until the temps hit around 40degF).
IMHO, trying to get things "right" with a stand-alone humidifier will only leave you chasing your tail and mucking up the house.
Best~
-d
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