How to Use the Holmes HM-1975 Humidifier

Meredith Jameson

The Holmes HM-1975 Humidifier is one of the company's "Cool Mist" humidifiers, which works by pulling dry, room-temperature air into the humidifier and passing it through a filter. This removes any deposits or minerals and sends the newly cooled air back into the room through a grill in the top of the humidifier. A Holmes Cool Mist humidifier can help maintain a room humidity level of approximately 40 to 50 percent, according to the company.

Daily Use

The Holmes Humidifier draws in room temperature air and filters it into cooler air
  1. Set the humidifier on a stable, moisture-resistant surface, as the moisture from the unit can damage floors or furniture.

  2. Pull the water tank from the main unit and turn upside down to remove the tank cap.

  3. Fill the tank with up to 1 gallon of cool water. Do not use warm or hot water, as this may cause the unit to leak. Close the tank cap in a clockwise motion until tight.

  4. Turn the tank back over and set into the base unit. Plug the electrical cord into a power source.

  5. Set the power knob at "Low (I)" for less moisture and "High (II)" for maximum moisture. Turn the knob to "Off (O)" when finished with the machine.

Filter Maintenance

  1. Monitor the "FilterCheck Indicator", which will move to "CHANGE" when it is time to clean the filter.

  2. Remove the main housing unit and tank. Lift out the old filter and discard.

  3. Replace with new filter and set the housing unit and tank back on the humidifier.


  1. Turn off the humidifier and lift the tank out of the main unit. Drain the water out of the tank and replace with clean water.

  2. Take the housing unit to a sink and lift out the wick filter. Drain out any water from the unit, rinse with clean water and wipe clean with a towel. Place the filter back into the base unit unless the "FilterCheck Indicator" shows that it is time to put in a new filter. Set the tank back on the unit and plug back in before use.

  3. Perform weekly maintenance by pouring 1 cup of vinegar into the base and scrubbing interior surfaces with a sponge. Drain and rinse well with water. Dry with a towel.

  4. Fill the tank half full with water and 1 tsp. bleach. Let sit for 20 minutes and wipe well with a sponge to remove any residue. Rinse well with water until no bleach can be detected. Wipe dry with a towel. Refill the tank with clean water and set back on the base unit.