What Is A Humidistat And How Does It Work?

There are many different types of humidity sensors and applications for them. But probably the most common types of humidity sensors are the humidistat and dehumidistat. These devices are used to control the operation of humidifying and dehumidifying equipment to keep humidity levels within a desired range.

Humidistats are used on humidifiers and sense the humidity level in the space in which it is installed. Good portable humidifiers have a humidistat installed on the unit and turn the unit on when the humidity level in the space drops below the setting. As the humidity level in the space drops a set of electrical contacts in the humidistat close turning the unit on.

Humidifiers installed in your central heating equipment will have a humidistat mounted on the return air duct or on a wall in your home and operate the same as the ones on portable units.

A dehumidistat operates basically the same as a humidistat but the electrical contacts open when the humidity level in the space drops below the setting of the dehumidistat controller turning the unit off. As the humidity in the space goes up the electrical contacts will close and the dehumidifier will operate and reduce the humidity in the space.

If you have problems with either of these controls you should just replace them even if you can find parts. Humidistat repair would probably cost you more than replacing the control.

Most of the humidistat and dehumidistat controls used in these applications will operate on 24v or 110v power. Another common use of dehumidistats is to operate fans to control crawl space humidity and provide ventilation.

Humidifier Options

Low humidity is usually only a problem in the winter months when temperatures drop substantially and the air holds less moisture. Some of the most obvious symptoms of low humidity are dry nose, itchy throat, static electricity, dry skin and chapped lips. Humidifiers are designed to maintain a comfortable humidity level in your home and […]