State University Extension
Home Maintenance And Repair - 01500319
Humidifying - Operating the Humidifier
The water output of an appliance humidifier is based on continuous
operation at standard rating conditions, not on the cycling of the
residential heating system. Humidifiers without humidistat run
continuously, while those with humidistat run continuously only when
the controls are set to do so. The humidistat cycles the unit on and
off as it senses different moisture needs caused by changes in indoor
and outdoor conditions, including:
1. Amount of moisture absorbed by the house and its furnishings during
the first few days of each humidifier season.
2. Amount of moisture generated by occupants and their activities, such
as cooking and laundering.
3. Humidity level desired.
4. Changes in outdoor temperature, relative humidity, wind direction
This article was written by Anne Field, Extension Specialist, Emeritus,
with references from Ohio Extension bulletin Equipment Factsheet, and
the Association for Household Appliance Manufacturers.
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Thomas G. Coon, Director, MSU Extension, East Lansing,MI 48824. This
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bias against those not mentioned.
information.was reviewed as
of June 2008. For more information about the contents please
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