What is the best way of using a humidifier?

The best way of using a humidifier is to keep it clean and measure the humidity levels. If both of these acts are not done, a humidifier can actually make you sick. Make sure that you change the water regularly and clean the water tank regularly making sure to rinse after you clean it. Its also important to change the filter. You can also check the level of humidity in the room using a hydrometer. They should be between 30-50%. If you have Asthma or Allergies you should consult a doctor before use.