To determine whether your humidifier is working effectively, you can follow several steps:

1. Check for Visible Signs of Operation
       Water Mist: If your humidifier is an ultrasonic or steam model, you should see a fine mist or steam                             coming out of the unit. This is a clear indication that it is working.
              Sound: Most humidifiers make some noise during operation. Listen for the sound of the fan or                              the water being vaporized.

2. Observe Humidity Levels
           Hygrometer: Use a hygrometer (a device that measures humidity) to check the humidity levels in                                 the room. The optimal indoor humidity level is typically between 30% and 50%. If                                   the humidity level is significantly below this range, your humidifier may not be                                       functioning properly.
        Room Comfort: If the air feels dry, static electricity is present, or you notice dry skin and throat,                                     your humidifier may not be working effectively.
3. Inspect the Water Reservoir
            Water Level: Check the water tank to ensure that it is filled. If the tank is empty, the humidifier                                    will not be able to produce moisture.
             Water Flow: If your humidifier has a continuous flow feature, make sure water is reaching the                                    unit properly.
4. Check for Blockages or Issues
                   Filters: If your humidifier has a filter, check if it needs cleaning or replacing. A clogged or                                    dirty filter can impede performance.
  Nozzles and Vents: Inspect the nozzles or vents for any blockages. Clean them if necessary to ensure                                  proper airflow.
5. Test the Settings
     Adjust Settings: If your humidifier has adjustable settings, try changing them to see if it affects                                       performance. Some units have settings for low, medium, and high output.
6. Inspect for Leaks
     Check for Leaks: Look for any water leaking from the unit. Leaks can indicate a malfunction or a                                        problem with the water tank.
7. Use a Room Temperature Test
     Temperature Change: After running the humidifier for several hours, feel the air. If the air feels                                        noticeably more humid (i.e., warmer and more comfortable), the humidifier is likely                                working.
8. Duration of Operation
        Running Time: Consider how long the humidifier has been running. If it runs for a long time without                                producing mist or increasing humidity, it may need servicing.

If you perform these checks and still suspect that your humidifier is not working correctly, consult the manufacturer’s manual for troubleshooting tips or consider contacting a professional for repairs.