Cold air can cause the indoor humidity to drop as low as 20%… Low humidity can cause a number of health problems like dry nose & throat, respiratory problems, & dry eyup, then when the indoor humidity is low, Furniture can be affected & books & art. These items can warp & crack when the humidity is low. There are ways to help the indoor humidity levels, but a humidifier is a equipment that can increase the humidity inside of a building. It can be genuinely small & help a single room or immense enough to add moisture to a immense building, then humidifiers are used to increase our comfort. My Dad was complaining about that dry air inside of our home last winter. Both of us had to run the gas oil furnace frequently due to all of the cold temperatures. The dry air was bothersome to my Dad & it was affecting her eyup. She tried to use a topical eye drop, however it did not help much. I suggested a room humidifier to help with the problem. The room humidifier turned out to be a superb idea. Both of us looked online to find a small equipment that was perfect for a single woman. The small humidifier was genuinely inhigh-priced & has many features like a night-light & unusual levels of moisture control. The humidifier absolutely helped almost immediately & the relief has been straight-forward to see. My Dad has felt much better since every one of us bought the humidifier for the family room. The problem with the dry eyup is less serious & the night light helps her see in the dark.