Humidistat vs Dehumidistat

Old 07-19-09, 07:48 PM
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Humidistat vs Dehumidistat

I have seen references to a humidistat being used to control the air conditioner for maintaining a set relative humidity level in an unoccupied house. I thought that it was a Dehumidistat that performed this function. Can they be used interchangably??? If so, how would the wiring be different?
Old 07-19-09, 08:25 PM
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It would be a de-humdistat. However, many devices are single pole, double throw so they can do both functions. For a de-humidistat the switch will close on a RISE in RH, while for a humidistat function, the switch will close on a FALL in RH. RH = Relative Humidity.
Old 07-20-09, 02:36 AM
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In my world a humidistat is merely a device to establish the humidity level, just like a thermostat is to control the temp.
Old 07-20-09, 04:24 AM
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In most cases that I have read about, when the thermostat does NOT control dehumidification, a HUMIDistat (opens on humidity rise) is used as an outboard control to slow a variable speed blower (increase dehumidification).


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