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How the Humidistat Operates
A humidistat is a device used to control the operation of space conditioning systems such as air conditioners, dehumidifiers and humidifiers. When used with an air conditioner, for example, the humidistat cycles the unit on and off based on humidity rather than temperature as provided with a regular thermostat. A humidistat set at 70 percent relative humidity, for instance, will cycle the air conditioner on when relative humidity reaches 70 percent or above, even if the thermostat setting does not call for cooling.
Proper Installation
A humidistat should be connected in parallel with the thermostat so each can operate independently of the other's control setting. Recommended settings when used with an air conditioner are 85 degrees for the thermostat and 70 percent relative humidity for the humidistat. Check with the manufacturer to determine the best settings in your area. Inappropriate settings could encourage more operating time than necessary and result in higher energy costs.
Alternate Methods of Humidity and Mildew Control
Setting the regular air conditioner thermostat to provide cooling for a few hours each day is a simple and economical way to control humidity. An 85-degree setting will generally work during the summer months in Florida. A timer switch could also be used to turn the unit on and off at preselected times.
Dehumidifiers are another option for humidity control. These small units are similar to an air conditioner but are designed solely to remove water from air. Air is circulated over a refrigerant coil and cooled below its dew point. Water condenses on the coil, collects in a pan and is drained out of the room. Average-size dehumidifiers cost less than five cents an hour to operate.
Mildew forms in locations that have poor air circulation as well as high humidity. Whether a family is home or away, it is best to keep mildew-prone areas such as closets, baths, and shower stalls open to increase natural airflow.
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