Dry air can be harmful and uncomfortable. Winter is especially tough on nasal passages and the entire upper respiratory system. A humidifier replenishes the moisture in your home and reduces unhealthy dry throats and skin, cracking woodwork, and even static electricity. Adding moisture to your home makes you more comfortable. You can usually adjust your thermostat a few degrees lower in the winter if the humidity level is being properly controlled, which helps to save energy and money.