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What is a dehumidifier?

A dehumidifier is a type of air conditioning appliance used to reduce high humidity in the air to restore a moderate moisture level indoors. Dehumidifiers provide a number of benefits which include better comfort in high-humidity environments, reducing or preventing mold, preventing the effects of high humidity on wood or other materials, and reducing dust mite growth.

Dehumidifiers typically use a refrigerant system powered by electricity to circulate coolant, creating a cold surface (fins) on which moisture collects and is then captured in a water tank as it is removed from nearby air. User controls typically include an automatic humidity maintenance mode as well as settings for manual operation.

They’re especially common in basements or attics, both of which can be subject to outside moisture entering, resulting in dampness which can lead to mold and mildew growth. Building material damage or damage to personal items in storage results from high moisture levels as well.

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