Does humidifier work when furnace fan is on?

A humidifier can only put moisture into the air when the furnace fan is running. Most thermostats have a fan switch that can be set to either “Auto” or “Manual” (sometimes labeled “ON”).

Should humidifier run without furnace?





Only run the humidifier when the furnace is on: If your ducts are in an unconditioned space (most people’s ducts are), running the humidifier while the ducts are cold increases your risk of mold growth.

Why does my humidifier run when the furnace is off?

If your furnace’s humidifier water runs even when your fan is off, it is likely an issue relating to the solenoid valve. The first step to understanding the problem is to check the solenoid’s wiring. First, flip the furnace breaker to make this process a much safer one.

When should I turn on my furnace humidifier?

Every spring, the water supply pipe valve should be turned off, the tray and sponge should be cleaned, and the humidistat should be set to OFF. In the fall, turn on the water valve, and set the humidistat to 35%.
Furnace Humidifiers 101.

Outside Recommended House Humidity
Summer months Off

What should you set your furnace humidifier at in the winter?

Humidity plays an essential role in the air quality inside your home. So, you need to adjust it accordingly to ensure there aren’t any damages to you or your home. In the summers, you might need to turn the furnace humidifiers off. For winters, it’s best to set it at 35-45% for a comfortable home.

How long should you run a humidifier in winter?





Whether you have used a humidifier before or want to get one, knowing how long to keep yours on is essential. From what we found, it’s best to limit your humidifier use to around 12 hours a day to prevent mold and mildew from developing in your home.

What should I set my humidifier to on my furnace?

Your that’s attached to your furnace or HVAC system is set based on relative humidity. A comfortable relative humidity for most homes throughout the summer, spring, and fall is between 30% and 50%. If you set your humidifier to this level, it should be comfortable for your home and family most of the year.

Are furnace humidifiers a good idea?

Having a furnace humidifier helps add moisture to the air, which makes your home more comfortable. The moist air can even help your house feel warmer while still burning the same amount of fuel.

Should humidifier be on in winter?

Humidity for Comfort
A humidifier is a necessity during the winter because the heated air from a furnace is dry. That dry air has a low humidity level that will absorb moisture from you and everything inside your home.

What is a healthy indoor humidity level in winter?



Ideally, a home should have a humidity level of about 45%. If it dips below 30%, it’s much too dry, and if it’s above 50%, the high humidity may start to feel uncomfortable. If your home humidity level stays around 45%, your living environment will be cleaner, safer, healthier and more comfortable.

What are symptoms of low humidity?

Here are some common signs of low humidity in the home:

  • Bloody noses.
  • Chapped and cracked lips.
  • Dry, itchy skin and eyes.
  • Cold and flu symptoms.
  • Itchy throat.
  • Dry, cracking wood and furniture.
  • Static electricity.
  • Allergy and asthma flare-ups.

What is the best humidity level for sleeping?



between 30% and 50%

Best Humidity for Sleeping
According to the Environmental Protection Agency, the best indoor relative humidity falls between 30% and 50%, and it should never exceed 60%. Other studies suggest 40% to 60% is a better range.

What humidity will mold grow?

Lesson 3 – Humidity
Sometimes, humidity or dampness (water vapor) in the air can supply enough moisture for mold growth. Indoor relative humidity (RH) should be kept below 60 percent — ideally between 30 percent and 50 percent, if possible.

What are the symptoms of mold exposure?

The most common symptoms of mold exposure include:

  • Coughing.
  • Postnasal drip.
  • Sneezing.
  • Dry, scaly skin.
  • Itchy eyes, nose, or throat.
  • Nasal congestion.


Is 65 humidity too high in a house?

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%.