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How Does A Humidistat Work? Find Out Here!

The humidity has been a big issue for you and you’re looking for some solutions. So you want to install a humidistat, but not sure how it works. Gathering some important information regarding a humidistat will help you know when and where to use it. 

How does a humidistat work? 

The humidistat comes with a sensing element made of a thing that is very sensitive to air moisture. It also includes a relay amplifier that will calculate the electrical resistance. Then it will switch on the humidifier one. Lastly, the humidistat will keep changing until it reaches the expected level of humidity. 

Are you still wondering how a humidistat works? The good news is, we have a guide to humidistats right here.

Without any further delay, let’s dive into this!

What Is A Humidistat?

A humidistat can be defined in simple words. It is what you use to measure as well as control humidity. It’s a part of the central air conditioning or heating system.

It doesn’t control it however it pleases though. It follows your desired humidity level you set on it. It makes the humidifier switch off the water supply accordingly. 

It’s usually found somewhere beside the wall-mounted thermostat. While creating an environment that is comfortable,it also helps prevent mold outbreaks. 

Hygrostat is another name for a humidistat. You can compare it to a thermostat as it controls humidity. Now, how do thermostats work? It’s actually to measure temperature. 

Humidistats are used for more than just controlling the humidity in your home. Refrigerators, microwave ovens, climate-controlled warehouses, and greenhouses all contain this substance.It’s occasionally used in the food and medical industries

How Does A Humidistat Work?

A humidistat’s primary function is straightforward.

A moisture-sensitive sensing element is a component found in a humidistat in the home. That’s also paired with a relay amplifier.

Fluctuating temperature and humidity increases the electrical resistance. The resistance is between the conductor sets on the detecting element.

Alternate metal conductors can accurately anticipate electrical resistance based on relative humidity.

The relay amplifier measuring the resistance will turn the humidifier on.

If the electrical resistance indicates that the humidity level is not appropriate, it will turn off.

The humidifier/dehumidifier and the central HVAC system are connected in a humidity management system. These help the airflow to be continuously regulated. However, you can keep your basement dry without a dehumidifier.

And because the humidistat adjusts the dampers, valves, and other switches, the humidity is controlled throughout the space.

The humidistat can be wired to the thermostat and used to manage the humidity in the home while the air conditioner is running. It won’t switch on the air conditioner when the humidity drops. However, if the humidity level climbs above a certain point, the air conditioner will switch on. This will aid in the most efficient operation of the HVAC system as well as cost savings.

A humidistat’s moisture-sensing element is part of the most important components. Alternate metal conductors are fitted on a flat plate to create this element.

Furthermore, by reading the signals produced by the detecting element, a relay amplifier connected to this element provides extremely accurate humidity readings.

Typically, the amplifier does this by detecting the electrical resistance, which varies with humidity conditions. And the metal conductors are to blame.

When the air is too dry, the humidistat activates the humidifier based on these measures. When the air isn’t dry, it shuts off the humidifier. However, sometimes the humidifier drain line can get clogged. 

The humidistat, thus, over-humidification or de-humidification of the room.

Where to Install A Humidistat?

Humidistats are frequently used in humidity-related equipment because they can read the precise quantity of humidity in the air.

In a stand-alone humidifier or dehumidifier, for example, a humidistat is commonly utilized. A humidistat is also used to control the temperature of the HVAC system’s valves, dampers, and other switches. It regulates the airflow to get the best humidity for the environment.

A humidistat is frequently used in various locations to control the ventilation fans in order to keep humidity levels at a specified level.

Because a humidistat is so long-lasting and dependable, it requires little or no maintenance. It’s more cost-effective and prudent to replace it if it malfunctions.

A few digital humidistats have recently become available on the market. They’re set up to monitor the relative humidity in a certain area. Also, you can add a junction box to extend wiring. 

Then they control the humidifier to turn on/off when it’s necessary. To help you, we have some best quality humidistats for you-

Product 1
Product 2

These are the recommended humidistats for you. Now, we will talk about the benefits of a humidistat.

What Are The Benefits of A Humidistat?

There are several advantages to using a humidistat. It can work with both heating and cooling systems. It’s also simple to maintain because it doesn’t require many buckets for refills.

The humidistat will take care of adjusting the thermostat for you. It also reduces the cost of electricity. It safeguards the home against the negative consequences of increased humidity.

Extremely dry air has been linked to respiratory issues, dry skin, chapped lips, an enhanced allergic response, sore throats, and other issues. By controlling the airflow, they can be avoided.


Question: How much does a humidistat cost?

Answer: A humidistat will set you back anywhere between $30 and $100. The manual version is more affordable. The automatic version, on the other hand, is on the more expensive end of the scale. So, based on your budget, you should purchase a humidistat.

Question: What level should I set my humidistat at? 

Answer: Set the relative humidity (RH) on your humidistat to 58 percent to be safe. Also, adjust your thermostat to 77°F to 80°F. The humidity level will be kept at 58 percent using these parameters.

Question: How would I know if my humidistat is working properly? 

Answer: Set the humidistat to the lowest setting or “off,” and the multimeter should show no voltage. Afterwards, set the humidistat to a setting that’s very high. For example, 80 percent relative humidity, or until you hear a”click” sound.


Hope we were able to answer your question: how does a humidistat work? We believe it cleared out all your confusion regarding it. Now you can choose to install a humidistat with ease. 

That’s all from your side. We hope to hear from you again!