Humidifier installation













A Guide to Humidifiers and Dehumidifiers

Ultrasonic Humidifier
  • Uses high-frequency energy to break the water up into tiny droplets, which are then dispersed into the air by a small fan.
  • Quiet and use little energy.
  • Has the potential of leaving a sticky white dust around the house if used with hard tap water.
  • Can pose health risks if the unit raises the level of airborne particles in the air.
  • For best results and to prevent pollutants in the air, use distilled water with this type of humidifier.


  • Evaporative Humidifier

  • Uses a wick and high-volume air to return moisture to the air.
  • The wick is a honeycomb arrangement of cellulose paper with a large surface area.
  • Operates by partially submerging the wick in the water while a fan forces air to pass through the upper exposed area, distributing absorbed water into the air.
  • Wicks will need replacing.
  • This type uses little energy and is easy to clean. Some units can be noisy.


  • Warm-Mist Device
  • Uses a heating element to restore moisture to the air.
  • The water surrounding the heating element is brought to near boiling and a fan cools and distributes the moistened air, which is slightly warmer than room air.
  • This type can be used with tap water and will not cause white dust.
  • Can be noisy and consumes more energy than other types.

  • Impeller Humidifier

  • Sprays droplets of water into the air.
  • An inexpensive type of humidifier.
  • Must be used with distilled water or with demineralizing tablets in the water




  • Floor-Vent Humidifier

  • Replaces standard floor vent registers.
  • Provides humidity for individual rooms without the need for a plug-in humidifier.
  • Uses a water chamber where homeowners can add water, which then passes through a wick filter and into the air when the furnace cycles on.




  • Furnace-Mounted Humidifier

  • Forces dry air from the furnace through a saturated foam element or plate.
  • Connected to the water supply so it is refilled automatically.
  • Another type sprays a fine mist of water into the heated air.
  • Uses an automatic reset humidistat to adjust moisture output to compensate for weather changes.


  • Evaporative Coolers

  • Sometimes called a swamp cooler.
  • Uses ice and cool water to cool and return moisture to the air.
  • Ice and cool water is mounted on top of the unit. As the ice melts, cool water flows over a wicking material. A fan mounted behind the wick creates a cool moist breeze.
  • Environmentally friendly as it uses little energy and contains no harmful chlorofluorocarbons.
  • Advise customers who will use this product to crack a few windows to prevent moisture build-up on inside walls.

  • Dehumidifier

  • Removes excess moisture from the air by blowing humid air over cold evaporator coils in a refrigerator system.
  • Moisture collects in a pan, and the unit will automatically shut off when the pan is full.
  • A humidistat controlling the dehumidifier will respond to changes in moisture content and is necessary for efficient energy consumption.
  • Courtsey of NRHA.org

    Information courtesy of http://www.nrha.org/


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    Dehumidifier Installation

    Building a Portable Cool Mist Humidifier

    Replacing Pin Connectors in a Humidifier

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