Controlling Indoor Humidity for Better Health

As a health-conscious person, you are likely already aware of the importance of indoor air quality to you and your family’s comfort, health, and well-being. For most people, indoor air quality primarily concerns the level of particulates and other matter in the home’s air. However, many overlook the importance of humidity and its impact on their health. Indeed, whether you suffer from respiratory issues like asthma or not, controlling indoor humidity is a key factor in maintaining good indoor air quality and maintaining comfort and health in the home.

According to the CDC, one in 13 people in the U.S. has asthma. This equates to roughly 28 million sufferers of chronic respiratory conditions. It affects around 7.7 percent of adults and roughly 8.4 percent of children in the country. In fact, asthma is the leading chronic respiratory illness in children, with around 6 million kids under age 18 affected in 2015. For such individuals, maintaining good levels of indoor humidity is particularly crucial. However, when indoor humidity levels are too high or too low, they can negatively impact even otherwise healthy people’s health.

Ideally, humidity in the home should be maintained at a level of between 35 to 50 percent. When it drops below 35 percent, as it is more likely to do during the drier fall and winter months, it can prompt irritations of the skin, eyes, throat, and nasal passages and cause chronic coughing to occur. When it rises above 50 percent, humidity can wreak even more havoc. High indoor humidity promotes an environment conducive to dust mites and mold spores, which can trigger allergic reactions. It can also provide an optimal breeding ground for various infectious diseases and even cause serious health risks like heat stroke.

High Indoor Humidity: Why It’s a Problem

If you’ve ever been outside on a day where the temperature is high and relative humidity is too, you already know how uncomfortable it is to be subjected to excessively humid air. Just as relative humidity can rise outdoors, it can become excessive indoors too. According to a study by the American Society of Heating, Refrigeration and Air Conditioning Engineers, or ASHRAE, high indoor humidity fosters the development, growth, and spread of harmful biological agents like viruses, dust mites, fungi, and bacteria.

In turn, these biological agents may negatively impact the health of people in the home in several ways, including:

  • infectious diseases, including the common cold and flu,
  • allergic reactions like eye, nose, and throat irritation, wheezing and coughing,
  • skin afflictions, including the exacerbation of eczema,
  • other problems like headaches, fatigue, and body aches.

In addition to negatively impacting indoor air quality, high humidity levels can slow down the drying of fabrics. This can cause the development of mold and mildew, which may then be dispersed more into the air, causing a cyclical effect that can make symptoms even worse.

If you have babies or children in the home or very older adults, it’s even more important to keep a close eye on indoor humidity levels and to take steps to correct them if problems arise. Such individuals have less mature or weakened immune systems and are therefore more susceptible to high indoor humidity dangers. Therefore, if humidity levels inside the home are too high, babies, children, and seniors may be more likely to develop problems like pneumonia, gastroenteritis, mumps, and asthma. In fact, it has been estimated that 50 to 70 percent of asthma cases are triggered by allergic reactions, which are more likely to occur in places with high humidity.

Effects of High Indoor Humidity

In addition to fostering an environment conducive to allergens and infectious diseases, high indoor humidity can wreak havoc on the body’s ability to regulate its temperature. That’s because the higher the humidity or percentage of vapor in the air, the higher the temperature feels. On hot days, the heat index conveys humidity’s effects on how the human body perceives temperatures. It applies just as much indoors as outdoors.

When the body is subjected to high heat, sweating is one of the main ways in which it works to cool down. The water excreted through sweating should ideally evaporate, which helps to bring relief from high temps. When humidity levels are high, the air is too saturated to absorb the evaporating sweat. As a result, the body has to work harder to cool down, and the blood thickens and is harder to pump around the body, which can prompt issues like fainting, heat exhaustion, and even heat stroke.

Low Indoor Humidity Can Be Harmful Too

It stands to reason that if high indoor humidity is harmful, bringing it down will bring relief. That is true, but excessively low humidity causes problems too. Since the human body is approximately 70 percent water, it needs moisture to function properly. It continually loses moisture through sensible water loss or water loss that is apparent – like urination – and insensible water loss, which is less readily apparent and may include moisture loss through sweating and breathing. The human body can lose up to two liters of water per day through such processes. When humidity is too low – indoors, it can get as low as 20 percent – the rate of this loss increases, causing health problems.

Some examples of how low indoor humidity can negatively impact health include:

Dry mucus membranes – When humidity is low, the body works harder to bring more in. The mucus membranes that filter the air and moisten it may become too dry. In turn, they are less capable of moisturizing the air, causing it to feel harsh. Additionally, their ability to filter out impurities, including viruses and bacteria, is compromised. This is partly why cold and flu season tends to occur during the drier fall and winter months.
Dry, cracked sinuses – Low indoor humidity can dry out the sinuses. They can then become cracked, and, in some cases, bleeding may occur. According to, nosebleeds seem to happen more often during times of low humidity.
Dry skin – The skin is the largest organ in the body, and it can become overly dry when air humidity levels are too low. This can cause issues like itchiness, and cracks in the skin may even develop. These can introduce even more pathogens into the body, increasing the odds of contracting diseases and suffering from allergic reactions.
Dry eyes – In response to overly dry air, the moisture of the eyes may become imbalanced. This can cause them to become itchy, dry, or watery when tear ducts overcompensate.

How to Resolve Low or High Indoor Humidity

You can’t correct indoor humidity problems without accurately measuring humidity levels in the home. Tools that may be purchased to facilitate this include:

  • Professionals typically use hygrometers – Specialized tools for measuring humidity levels only, these devices.
  • Digital indoor hygrometer-thermometers – The cheapest and most common way to measure indoor humidity levels, these devices measure indoor temperatures and humidity levels. However, they must be checked often and directly, and it’s easy to forget to do so.
  • Home weather stations – These devices measure various atmospheric conditions, including temperature, humidity, and atmospheric pressure. Again, though, they must be checked regularly and directly, so it’s easy to overlook spikes or drops in indoor humidity levels even while using one.
  • Smart hygrometers – Also known as smart home sensors, these devices may also measure various atmospheric conditions. Like other smart home devices, they may report changes to apps that are used on mobile devices like smartphones and tablets. Through push notifications, you can stay abreast of indoor humidity levels, which allows you to act more quickly upon them if they change drastically.

Once you get a sense of whether indoor humidity levels tend to be too low or too high, you can take steps to correct the problem. Sometimes, plumbing or structural issues in the home may be the culprits; in such instances, professional repairs or renovations may be in order. Symptoms of low humidity may be assuaged by staying hydrated and using lotions or moisturizers. Improving the home’s ventilation may help address excessive indoor humidity, and keeping air conditioning units well-maintained may also be beneficial.

With all of that being said, the best way to address low or high indoor humidity is through the use of modern appliances that are specifically designed for such tasks. Since dry air can have such a bad impact on health and exacerbate allergies, there is a huge demand for home humidifiers. Whole-home humidifiers, or furnace humidifiers, include direct water lines that provide a consistent source of water. The air that is forced through the ventilation system is simultaneously moistened through evaporation. As long as doorways are kept open, humidity levels across the home may then be increased.

More popularly, several types of portable humidifiers are available for increasing indoor humidity levels. Some use cool mist while others use warm mist. Warm-mist humidifiers are ideal for soothing sinuses and thinning mucus secretions and are therefore popular for addressing allergic reactions and symptoms. However, cool mist humidifiers are better suited for warm environments and larger areas.

The primary types of humidifiers are:

  • Evaporative Humidifiers – This type of cool-mist humidifier draws air in, pushes it through a moistened wick that is submerged in water, and then ejects it as a cool mist evaporates into the air.
  • Air Washer Humidifiers – These cool-mist humidifiers increase humidity levels while purifying the air. They feature filter discs submerged in water and rotate to remove larger pathogens, including viruses and bacteria. They are believed to provide more direct allergy relief for those who suffer from such respiratory issues.
  • Ultrasonic Humidifiers – Available in warm- and cool-mist varieties, ultrasonic humidifiers rapidly vibrate the water, causing it to turn into tiny particles. A fan then projects these particles as a fine mist that then evaporates into the air.
  • Steam Vapor Humidifiers – These devices heat water to a high temperature and then release it as steam vapor. The heat used can be high enough to destroy things like algae, mold, and bacteria, resulting in moister yet purer air.

If you discover that the humidity in your home is too high after measuring it with a device like a smart hygrometer, a dehumidifier may be in order. Whole-house dehumidifiers are available, but they are quite expensive. If your home has central air conditioning, you can likely make do with a portable dehumidifying appliance. These devices have fans that move the air that’s drawn in over refrigerated coils. These coils pull moisture from the air, and the moisture then drips into and is collected by a tank. The air that is pushed back out is then much drier.

Whether you decide that you need a humidifier or a dehumidifier for your home, keep in mind that such devices are designed to cover the specific square footage. In other words, some may be suitable for small rooms, while others may be capable of affecting humidity levels across much larger areas. Therefore, keep the total area that needs to be conditioned in mind before shopping for a dehumidifier or humidifier for your house.

For Better Health, Measure and Control Indoor Humidity

As you can see, indoor humidity levels have many direct impacts on comfort, health, and well-being. Therefore, they play a crucial role in indoor air quality and should be monitored and adjusted if necessary. Whether you or someone in your home has asthma, allergies, or other respiratory issues or not, humidity levels in the home can negatively impact the health of everyone who lives there. It is well worth it, then, to invest in a device for measuring humidity levels – and in a humidifier or dehumidifier, depending on what you discover.

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My name is Ryan. I have had a hard time dealing with my allergies. Happily, I found that an air purifier was effective to ease my allergy symptoms. I spent a lot of time researching the best air purifier. I know how hard it can be to find the suitable one. During the reading period, I also read a lot about humidifiers and dehumidifiers. I learned the mechanisms behind the technologies as well as the manufacturers and organizations within the industry. I now feel convinced that I have built a guide that shows you all you need to know about air purifiers, humidifiers, and dehumidifiers. So I came up with the idea of creating this website.

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