What does a humidistat control
Dylan Hughes
Published May 25, 2026
A humidistat (sometimes called a humidistat control) is a device that works with a home’s heating and cooling system to automatically adjust the amount of moisture in the air to maintain a specific humidity level throughout the home.
What should my humidistat be set at?
For outdoor temperatures around 10 degrees, set the humidistat to 30 percent. At an outdoor temperature around 20 degrees, a 35 percent humidistat setting is appropriate. For an outdoor temperature near 30 degrees, set your humidistat at 40 percent.
Is a humidistat necessary?
It is not always easy to regulate the humidity level in your home, and that’s why you need a humidistat. It is a measurement device for monitoring and maintaining the humidity level in the air.
When should I turn on my humidistat?
What Should My Humidistat Be Set at in the Summer? While everyone’s home comfort preferences will vary, we recommend a humidistat setting between 35 and 45 percent for Summer.When should I turn off my humidistat?
Turn Off Humidifier After Heating Season: So please remember to turn your humidifier off at the end of each heating season. But not only that, you should use this time to clean your humidifier and remove or replace the water panel.
Is 60% humidity too high?
A home should have a relative humidity of 30% to 60%. Above 60% and you have what’s considered “high” humidity. Besides being less comfortable, high humidity causes a host of other problems in your home, including: Growth of fungus and mold in various parts of the home.
What should I set my humidistat to in winter?
If the outdoor temperature is near -10 F, set the humidistat to 20 percent. If the temperature is near 0 F, set the humidistat to 25 percent. If the outdoor temperature is near 10 F, set the humidistat to 30 percent. If the outdoor temperature is near 20 F, set the humidistat to 35 percent.
Does a humidistat save money?
By running your system to combat humidity, the humidistat can and will save you money on your electric bill. It will run your a/c system more efficiently sparing it the needless wear and tear and help extend the unit’s life.How do you know if your humidistat is working?
Turn the humidistat to a very low setting or to “off.” The multimeter should register no voltage. Then, turn the humidistat to a very high setting, such as 80 percent relative humidity, or until you hear a “click” sound. The multimeter should register about 24 volts if the humidistat is functioning correctly.
Can a thermostat control humidity?Your home’s thermostat is used to regulate the temperature, but it can also affect indoor humidity levels. In both the summer and winter months, humidity plays a role in your comfort and HVAC performance.
Article first time published onDo Humidistats dehumidify?
Before the humidity ever reaches such an undesirable level, your humidistat would signal your dehumidifier to turn on. Once the desired humidity level is reached, the humidistat will turn off the dehumidifier.
What is the best humidistat?
- BEST OVERALL: Govee WiFi Temperature Humidity Indoor Hygrometer.
- RUNNER UP: ThermoPro TP55 Digital Hygrometer.
- BEST BANG FOR THE BUCK: Habor Hygrometer Indoor Thermometer.
- BEST FOR GREENHOUSES: Govee Thermometer Hygrometer.
Do all dehumidifiers have a humidistat?
Many dehumidifiers also have a humidistat, which allows you to set your desired level of relative humidity. A humidistat has two parts: a sensing element and a relay amplifier.
What should I keep my humidistat at in Florida?
According to the EPA (Environmental Protection Agency), it is recommended that Florida residents keep the indoor relative humidity below 60% relative humidity. Ideally, that percentage should be between 30% to 50%.
What should the thermostat and humidistat be set at in Florida?
You’re leaving for an extended time before the summer heat hits South Florida. What should you set the Thermostat and the Humidistat to? Answer: Set Humidistat between 55 – 60{cbc1ec9060494373382831167a109e1a5224e42009f3520b956202bdd10dac53}.
How do I turn off my humidistat?
If you aren’t sure how to cut off the water to your central humidifier, simply find the copper or plastic water line that is connected to your humidifier, follow it back until you find a valve, then turn the valve counterclockwise until it is all the way shut off.
Is humidity higher in winter?
There are two primary measures of atmospheric moisture: relative humidity and dewpoint. … Consequently, relative humidity is actually higher in winter than in summer (76% vs. 66%, according to climatology). Dewpoint is the temperature to which air must cool to become saturated, without regard to changing temperatures.
Is 70 humidity too high?
Research from the Building Science Corporation found that humidity of 70% or higher adjacent to a surface can cause serious damage to the property. The Health and Safety Executive recommends that relative humidity indoors should be maintained at 40-70%, while other experts recommend that the range should be 30-60%.
Do fans lower humidity?
Switch on Ceiling Fans When it is warm, and you are looking for an effective yet inexpensive way to reduce humidity, ceiling fans are a straightforward solution. When you turn on a ceiling fan, the breeze evaporates excess moisture, which makes you feel cooler.
Why is my house at 60% humidity?
Bacteria, viruses, fungi, and some pests such as dust mites begin to thrive in humidity outside this range. Indoor relative humidity above 60% for several hours in an air-conditioned indicates that the air quality control should be improved. Monitoring the indoor humidity is not a guarantee that mold will not develop.
Can a humidistat fail?
The humidistat monitors the level of moisture in the air. When the moisture level is too high, the contacts in the humidistat close to allow the dehumidifier to run. If the humidistat contacts fail, the dehumidifier will not run. To determine if the humidistat is defective, use a multimeter to test it for continuity.
Are attic fans with humidistat effective?
Most experts agree that passive ventilation using high and low vents is the most effective method of venting an attic. … Those equipped with humidistats will fire up in the winter as well and draw warm moist air out of the home through the attic floor resulting in even more attic moisture, not less.
How do I control humidity in my house?
Use dehumidifiers and air conditioners, especially in hot, humid climates, to reduce moisture in the air, but be sure that the appliances themselves don’t become sources of biological pollutants. Raise the temperature of cold surfaces where moisture condenses. Use insulation or storm windows.
How do I set humidity control?
- Adjust the temperature on the thermostat. During the summer the temperature is ideally set between 78 and 80 degrees. …
- Set the thermostat to “Auto.” Using the auto setting on the thermostat lets the evaporator coils cool sufficiently. …
- Buy an inexpensive hygrometer.
Does ecobee control humidity?
With the Dehumidify Using AC / AC Overcool feature, your ecobee thermostat can use your air conditioning to help reduce excessive humidity in your home even if you don’t have a dehumidifier installed.
What causes high humidity in a house?
Moisture condenses into water droplets when warm, humid air contacts a cool surface. Cooking, bathing, drying clothes, washing dishes and other everyday activities add moisture to the air. Some heating appliances, including unvented natural gas or kerosene models, also increase the moisture inside your home.
How much does a humidistat cost?
A humidistat costs $30 to $100 with manual versions on the lower end of the price spectrum and automatic versions on the higher end. This device automatically checks humidity in your home.
Can you over humidify a room?
Humidifiers can be overused. In fact, when you overuse your humidifier, the humid air may have harmful effects. Furthermore, using your humidifier improperly can also have negative effects.
Do dehumidifiers use a lot of electricity?
Dehumidifier energy use is rather low. An average small 30-pint dehumidifier uses 300W of energy. … Essentially, a dehumidifier draws much less electricity than a water heater, an air conditioner, even a hair drier. An average dehumidifier draws about as much energy as a computer.
What setting should I set my dehumidifier?
The optimal range for a home dehumidifier is to use a setting between 30%-50%, based on your comfort. 45% is reported by many people as ideal. Note: You can also use an air purifier alongside a dehumidifier to deal with dust mites, pet dander, or other air quality problems.
What are the disadvantages of dehumidifier?
Con: Noise and Heat Dehumidifiers also tend to blow warm air out of the back of the unit. In the winter, this can be an advantage — but not so much in the summer. Position the back of your dehumidifier in a doorway so that it doesn’t heat up the room from which you are removing excess moisture.