 and furniture, not to mention your nasal passages and sinuses. My favorite kind of furnace humidifier is the self-cleaning, no-moving parts kind like April Air or Honeywell. You can even buy versions with electronics that take over the furnace fan control. Remember, the humidifier only works when the fan is running. When the sensor sees lower-than-set humidity, the controller will override the thermostat and turn on the fan. Of course, you'll still be able to get heat whenever you need it.