Pros and Cons


  • Safer in homes with children/pets
  • Will lower a room’s temperature slightly
  • Better in areas with soft water
  • The ultrasonic types are quieter than the warm mist type
  • Evaporative type can humidify a larger space



  • Ultrasonic type are only effective in a limited space
  • Needs to be cleaned on a regular basis to avoid the growth of mold and bacteria
  • Filters need to be replaced regularly
  • Higher long term cost
  • Essential for the water to be kept “fresh” to avoid bacteria
  • Takes longer for the air to become humidified
  • Evaporative type tends to be noisy