Choose an efficient dehumidifier

Why? Dehumidifiers can be very useful for maintaining comfort and preventing the growth of mold and mildew—yet they use a surprising amount of energy. A standard dehumidifier uses roughly twice the energy of a new refrigerator. 
What to look for:
  • An ENERGY STAR® qualified model. These use up to 15% less energy than a similarly sized conventional unit but remove moisture just as well.
  • A high Energy Factor (EF). The EF measures a dehumidifier's energy efficiency in liters of water removed per kilowatt-hour.
  • An appropriate size. ENERGY STAR provides a table to help you determine what size dehumidifier you need based on the size and dampness of the room to be dehumidified.
  • A built-in humidistat. This lets you set the relative humidity (RH) you would like for the room — 30-50% is generally considered optimal. Once the room reaches the desired RH, the dehumidifier will cycle on and off to maintain that level.


Good to know:

  • Locate the dehumidifier away from sources of dust and dirt, which can clog coils and grills.
  • If your dehumidifier does not have top-mounted discharge, make sure the dehumidifier is located away from walls and furniture, so that air can circulate freely around the unit.
  • Close doors and windows to the space being dehumidified while the unit is running.

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