We see many homes in western canada that do not upkeep the humidifiers on their furnaces. Many positive aspects come from warm moist air in your home.
1) keeps window and door seals tight and not shrinking.
2) hardwood in home stays humidified, meaning it has less chance to shrink.
3) our bodies need moisture. We sleep better with a little moisture in the air.
If you have exotic hardwood or maple, beach, birch or walnut hardwood, your humidifier is essential.