We run vaporizers during the coldest/driest weather because of our human needs. Not for my guitars. I find super low humidity absolutely miserable with everything from chapped lips to cracked fingertips to nosebleeds if the house stays too dry for too long. Plus the stupid static electricity when you walk across a rug.1) I voted climate controlled but not like a special room, just the same as humans needs include climate controlled, I run a humidifier in the house in winter.
I'm probably more sensitive than any of my musical instruments