Have you ever woken up with a sore throat, itchy skin, or even a headache? Most likely, it’s because your home has too little dampness.

As the weather changes and the temperature drops, the air inside your home can become dry and uncomfortable.

But did you know that the amount of water in the air can also affect your health, your home, and even your energy bills? So, relative humidity comes into play.

In this piece, I’ll talk about what relative humidity is, why it’s important, and how you can use it to make your home healthier and more comfortable.

This is a must-read for anyone who wants to breathe better and feel better at home, whether they already have a humidifier or are thinking about getting one for the first time.

Understanding Relative Humidity

Understanding Relative Humidity

RH is a way to figure out how much water vapor is actually in the air compared to how much water vapor can be in the air at the current temperature.

It is generally given as a percentage (%), and the higher the number, the more humid the air is.

When the relative humidity is 100%, the air is full of water vapor and has reached the dew point.

RH is not the same thing as pure humidity, which is the amount of water vapor in 1 m3 of air.

Absolute humidity doesn’t show how humid the air is because the more water vapor in the air is absorbed at a lower temperature.

Because of this, relative humidity is used to talk about how wet the air is.

Measuring Relative Humidity

A hygrometer can be used to measure the relative humidity.

Most current dehumidifiers have a humidistat built in to measure relative humidity levels.

This lets the user set a specific desired humidity level for easy, automatic, and hands-free operation.

Davis’s custom network of sensors is made to measure humidity, temperature, and other levels inside and outside in a particular setting to meet specific needs.

Maintaining Ideal Relative Humidity Levels

Maintaining the ideal relative humidity level for indoor areas is important for comfort, health, and protecting the building and its contents.

Indoors, the best relative humidity level is between 30% and 60%.

The American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) says that room relative humidity should be between 30% and 60%.

The Environmental Protection Agency and the Consumer Product Safety Commission also say that a humidity level between 30% and 50% is best for comfort.

With the right relative humidity level, mold, which can be bad for your health, can’t grow or spread.

When the humidity inside is more than 50%, it can cause mold to grow and cause windows and water tanks to fog up.

When the humidity inside is less than 30%, it can be uncomfortable and even bad for your health.

Seasonal Variations

The best amount of relative humidity for indoor spaces can change with the season and the temperature outside.

In the summer, for example, the best humidity level inside is between 40% and 50%.

The right humidity amount inside is between 40% and 60%.

Maintaining Ideal Relative Humidity Levels

To keep the relative humidity level at the right level, it is important not to oversize the HVAC system, especially in places with a lot of humidity.

In places where wetness can build up, it is also important to make sure there is enough air flow.

Most building rules say that attics and crawl spaces need to have air flow through them.

The Importance of Understanding Humidity Levels for Humidifiers

Humidity levels play a crucial role in the effectiveness of humidifiers.

Relative humidity is the amount of moisture in the air compared to the maximum amount of moisture the air can hold at a specific temperature.

The ideal relative humidity level for indoor comfort and health ranges from 30% to 60%.

Humidifiers work by adding moisture to the air to increase humidity levels.

However, if the humidity level exceeds 60%, it can promote the growth of mold, mildew, and bacteria, which can lead to respiratory problems.

On the other hand, if the humidity level is too low, it can cause dry skin, throat irritation, and static electricity.

Therefore, it is essential to monitor and maintain the proper humidity level to optimize the benefits of using a humidifier.

For more information:

Healthy Humidity Levels: Tips & Benefits

Impact of Relative Humidity

Understanding Relative Humidity and Its Impact on Health and Comfort

The amount of water in the air, or humidity, can have a big effect on our health and happiness.

High humidity can make us feel hotter and less comfortable, while low humidity can make our skin dry, our eyes red, and give us trouble breathing.

Relative humidity is the amount of water vapor in the air compared to the most water vapor the air can hold at a certain temperature.

It is a big part of how comfortable and healthy we feel.

Maintaining a Healthy Relative Humidity Level

The American National Standards Institute says that the relative humidity level in places where people live should be between 30% and 60%.

When the relative humidity is below 30%, the air is too dry, and when it is above 70%, the air is too wet.

Around 50% relative humidity is a good level for health.

How cozy a room is and how well we feel can be affected by how high or low the relative humidity is.

Low humidity can cause dry skin, itchy eyes, and breathing problems, while high humidity can make you feel tired and lethargic.

Keeping a healthy relative humidity level can help stop these problems and make an indoor space that is warm and healthy.

The Role of Relative Humidity in Mold and Bacteria Growth

Mold and germs grow in large part because of how humid the air is.

When the relative humidity is above 60%, there is a chance that mold will grow.

When the relative humidity is above 80%, the chance of mold growth goes up.

When the relative humidity is high, it can also cause condensation, which leaves water on objects and makes a good place for mold to grow.

Some surfaces can feed bacteria, which is another important thing to think about.

To stop mold growth, it is important to keep the relative humidity inside below 60% and, ideally, between 30% and 50%.

Bacteria can also grow in places where there is a lot of wetness.

Bacteria do well in wet places, and high humidity gives them the moisture they need to grow.

So, it is very important to keep the humidity levels inside under control to stop bugs and mold from growing.

Mold and germs are hard to get rid of if you don’t control the moisture.

If water leaks or spills inside, you need to act fast and dry wet or damp materials or areas within 24 to 48 hours to stop mold and bacteria from growing.

Relative Humidity and Household Items

Effects of High and Low Relative Humidity

High relative humidity can cause things made of wood, like furniture, window and door frames, to bend, crack, and split.

When humidity is high, wood swells, and when humidity is low, it loses the moisture it has stored.

This steady change stresses wood over time.

High humidity can also cause mold to grow indoors and make people feel sick.

Low relative humidity, on the other hand, can cause wood to bend or split because there isn’t enough water in the air.

It can also make static electricity worse and mess with things like printers and computers.

Ideal Relative Humidity Range

A home should have between 30% and 50% relative humidity.

Within this range, wooden furniture won’t shrink or grow by a lot.

But air can affect things made of plastic and metal.

High relative humidity gives materials the wetness they need to start harmful chemical reactions and makes it easier for mold to grow and insects to move around.

When the relative humidity is 5% or less, building materials and wood furniture can shrink, which can cause them to crack or twist.

Effects of Relative Humidity on Museum Objects

Plastics and other biological materials last a lot longer in museums if the relative humidity and temperature are lowered.

Changes in temperature are more likely to hurt museum items than changes in humidity.

When the relative humidity changes, hygroscopic things like wood, ivory, skin, and paper change size.

To keep things working for longer, it is best to keep the temperature and relative humidity at stable, moderate levels.

Humidifiers and Relative Humidity

By adding moisture to the air, humidifiers can help control the relative humidity level in a home or office.

Indoor air should have a relative humidity of between 30 and 50 percent.

A humidifier can help keep the humidity inside at this level, which is healthy and more comfortable for the home or office.

It can also help with dry skin, shocks from static electricity, and breathing problems that can happen when the humidity is below 30%.

Types of Humidifiers

Humidifiers can either make cool mist or warm mist.

Warm mist humidifiers heat water to make steam, while cool mist humidifiers use a fan to blow water into the air.

Consider getting a humidifier with a built-in hygrometer that keeps humidity in a healthy range.


Measuring Humidity Levels

A hygrometer can be used to measure the amount of moisture in the air.

This tool, which looks like a gauge, measures how much water is in the air.

To stop mold growth and other health problems, it’s important to keep the humidity inside between 30 and 50 percent.

If the humidity isn’t high enough, you can use a humidifier to bring it up.

If the humidity is too high, you can open the windows or use a dryer to bring it down.

By keeping relative humidity at a steady, moderate level, we can keep our homes healthy and relaxing and make sure that our things last longer.

Choosing and Maintaining a Humidifier

Humidifiers are machines that add water mist or steam to the air to make it more humid.

Humidifiers come in four main types: evaporative, impeller, ultrasonic, and heater.

Each kind makes and sends hot or cold moisture into the air in a different way.

Types of Humidifiers

  • Evaporative humidifiers use a filter to trap minerals and impurities, and then a cool invisible mist evaporates into the air. They are generally easy to clean, are more effective in larger areas, and work better in warmer climates.
  • Impeller humidifiers use a rotating disk to fling water at a diffuser, which breaks the water into tiny droplets that float into the air.
  • Ultrasonic humidifiers produce a cool mist with ultrasonic vibration.
  • Vaporizer or warm mist humidifiers heat water to produce steam, which is then released into the air.

Choosing the Right Humidifier

What kind of humidifier is best for your place and needs depends on you.

Cool mist humidifiers, for example, are great for warmer areas because they add moisture to the air without making the room warmer.

Warm mist humidifiers are better for places where it is cooler because they warm up the air.

Central humidifiers are part of a home’s heating and cooling system and are meant to make the whole house more wet.

Ultrasonic humidifiers are usually quieter than other types of humidifiers and are good for bedrooms.

Factors to Consider

When picking a humidifier, you should think about things like the size of the room, the climate, and how easy it is to use and keep up.

Also, it’s important to keep humidifiers clean and free of mold and bugs by following the manufacturer’s instructions.

Before you use a humidifier, talk to your doctor if you or your child has asthma or allergies.

Maintenance and Cleaning

To make sure your humidifier works well, you should clean it at least once a week or as often as you need to to stop bacteria and other dangerous microorganisms from growing in it.

To keep mold and other germs from growing in your humidifier, you should rinse it, dry it with a towel, and fill the tank with fresh water every day.

Once a week, the tank and the well in the base need to be cleaned and sanitized more thoroughly.

To get rid of mineral buildup, you can use vinegar or a solution recommended by the manufacturer.

To clean the humidifier, use a 10% bleach solution.

If you use bleach or other cleaning chemicals, make sure to rinse the tank with several changes of water so that the machine doesn’t release them into the air the next time you use it.

Additional Tips

Fill the water tank with purified water, and keep the humidifier away from direct sunlight and sources of heat.

When the humidifier isn’t being used, it should be put away properly so that dust and other debris don’t build up.

Also, follow the manufacturer’s instructions for when to change filters and wicks.

If someone in your home has asthma or bad allergies, the humidifier should be cleaned even more often.

By doing these things, you can make sure that your humidifier keeps working well and gives you the right amount of humidity.

Safety and Monitoring

Risks Associated with Using Humidifiers

Too much dampness in a room can be dangerous, which is one of the risks of using a humidifier.

Keep track of humidity levels and use a hygrometer to keep an eye on the dampness in your child’s bedroom.

Between 30% and 50% is the best range for humidity.

Another risk is that dirty humidifiers can give off dangerous substances that can hurt your health.

Microorganisms can grow in humidifiers, so it’s important to clean them often and change the water in them every day.

Also, you should use distilled water so that you don’t release chemicals into the air.

There are different risks that come with different kinds of humidifiers.

It is important to keep cool mist humidifiers clean because they can release more dangerous substances into the air.

On the other hand, humidifiers that heat or boil the water inside them could be dangerous.

If a humidifier is going to be used in a child’s room at night, you should think about the best way to do it.

Maintaining Good Indoor Air Quality

To keep mold and germs from growing in humidifiers, it is best to follow the manufacturer’s instructions.

It’s also important to change the filter in your central air conditioning and heating system and the filter in your fan on a regular basis.

Before using a humidifier, you should talk to your child’s doctor if he or she has allergies or asthma.

For good indoor air quality, you should keep an eye on and change the relative humidity levels in your home or office.

A moisture or humidity gauge, also called a hygrometer, can be bought at most hardware shops and used to measure the amount of moisture in the air.

Hygrometers come in both analog and digital forms, but digital ones are more exact.

Some digital hygrometers can be connected to a smartphone or a distant display.

This lets you keep an eye on humidity levels from afar and get alerts when humidity is too high or too low.

Increasing or Decreasing Humidity Levels

You can use a vaporizer or mister to make the air more humid.

These devices add wetness to the air, making it easier to breathe and making it less likely that your skin or lungs will get dry.

If it’s not muggy outside, you can open the windows to bring down the humidity level.

If the humidity level is too high, there is a chance that mold will grow.

If the humidity level is too low, there is a chance that it will be too dry.

It’s important to keep an eye on humidity levels, since they can change with the season and the temperature outside.

By learning how to measure humidity and keeping an eye on the quality of the air inside, you can avoid the problems that come with too much wetness.

Innovative Dehumidifier Systems has a secondary dehumidification system that removes moisture quickly and reliably.

This helps you find the right level of humidity throughout your property.


In conclusion, relative humidity is an important part of keeping the air inside a healthy level.

Whether you have a humidifier or want to buy one, it’s important to know how the moisture in the air affects your health and well-being as a whole.

Even though it’s easy to get caught up in relative humidity numbers and measurements, it’s important to remember that there’s no one-size-fits-all answer.

When it comes to the amount of moisture in the air inside, what works for one person might not work for another, so it’s important to think about each person’s wants and preferences.

As you learn about humidifiers and how much moisture is in the air, keep in mind that the end goal is to make a comfortable and healthy indoor setting.

Whether you like a little more or a little less moisture in the air, there are choices to help you find the right balance.

So, when deciding if you should buy a humidifier or not, keep in mind that the key is to find the right mix for you and your home.

With a little study and careful thought, you can make your indoor space comfortable and healthy, which will help your overall health.

Looking for a new Humidifier?

Choosing a gadget can be very difficult if you know nothing about the technology.

Some will pay for features they do not need while others may not consider what they really want.

So I created this quick, newbie guide to help you focus on what is really important to you:

The Best Humidifier (For You!)

Links and references

  1. “Humidity: A review and primer on atmospheric moisture and human health” by Robert E. Davis, National Geographic Society’s “All About Humidity” webpage, ScienceDirect Topics overview of relative humidity, Aprilaire’s webpage on relative humidity, Live Science article on relative humidity.

My article on the topic:

Air Moisture: The Key to Healthy Living