If you are buying a 70-pint humidifier to use in different places within the home, consider purchasing a wheeled one for easy portability. You may also consider purchasing one with air cleaning properties so that you can remove bacteria from the air using your humidifier. Energy-efficient humidifiers are preferred so that you can save on your power bills. Generally, 70-pint humidifiers produce less noise than their 50-pint counterparts.