Dr. Andrew Stiehm is a pulmonologist with Allina Health.
"The colder it is, the less humidity there can be, so the less water there is in the air, which means as you breathe, you start losing more water, and you start to dry out, so your throat gets drier, your lungs get drier," Stiehm said. "Even inside, and then there's no humidity from the outdoors entering the house either."
Stiehm says that could affect your health. The World Health Organization says for most generally healthy people, the thermostat should be 65 or warmer in winter. And for people with lung conditions, 70 or higher. So there are guidelines, but there's also reality.