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You can roughly guess the humidity by its "feel" on your skin, but to be accurate use a thermo-hygrometer. To estimate how many dehumidifiers to place, see the Specifications below. How the Machine Works DrizAir units are refrigerant dehumidifiers. They operate by blowing moisture-laden air from the room across a cold evaporator coil. Moisture in the air condenses on the coil, drips off, and then is removed through a drain hose or pump. Now warmer and drier, the air passes back into the room to