Choose an energy-efficient dehumidifier

Why? Dehumidifiers can be very useful for maintaining comfort and preventing the growth of mold and mildew — yet they are surprisingly big energy consumers. A standard dehumidifier can use as much energy as your refrigerator, which is more than most appliances in your home. Choose an efficient dehumidifier to control humidity with less energy.
What to look for:
  • An ENERGY STAR® certified model. These use at least 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 litres 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 — 35-55% is generally considered optimal. Once the room reaches the desired RH, the dehumidifier will cycle on and off to maintain that level.
  • An hygrometer will help you determine the relative humidity.  You can purchase one for around  $20 - $30 at a hardware or home improvement store.


  • Close doors and windows to the space being dehumidified while the unit is running.
  • Place 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 it is placed away from walls and furniture so air can circulate freely around the unit.
  • Regularly check the condensate container and empty as needed. Consider piping it directly into a drain to eliminate the need to empty.

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