What Are the Health Consequences of Excessive Indoor Humidity and How Can We Mitigate Them?

March 26, 2024

When you think about the factors that contribute to a comfortable living environment, your mind might first jump to physical aspects like comfortable furniture or aesthetic decor. However, there’s another crucial, though sometimes overlooked, component to consider: the humidity level in your house. The amount of moisture, or humidity, in your indoor air can have significant impacts on both your health and the state of your house. By understanding the problems associated with high levels of indoor humidity and knowing what steps you can take to control it, you can ensure a healthier, more comfortable living environment.

The Dangers of High Indoor Humidity

Before we delve into the specific challenges that high levels of indoor humidity can present, it’s crucial to understand what we mean by "high" humidity. Relative humidity refers to the amount of moisture in the air compared to the maximum amount the air could hold at the same temperature. In general, indoor humidity levels above 60% are considered high and can lead to a variety of issues.

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One of the most immediate problems high humidity can create is a general sense of discomfort. You may feel warmer than the actual temperature because high humidity interferes with your body’s ability to cool itself through sweat evaporation. This can make your home feel stuffy and uncomfortable, particularly during periods of heat.

High humidity can also lead to serious health issues. It creates an ideal environment for mold and dust mites, which are common allergens. Exposure to these allergens can cause symptoms such as coughing, itchy eyes, and skin irritations. For people with asthma or other respiratory conditions, high humidity can exacerbate their symptoms and lead to more frequent or severe attacks.

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The Impact of Humidity on Your House and HVAC System

High indoor humidity doesn’t just affect your health—it can also cause significant damage to your house and HVAC system. Moisture in the air can condense on your walls, ceilings, and other surfaces, leading to water damage and mold growth. Over time, this can weaken structural elements of your house and cause costly damage.

Your HVAC system can also suffer under high humidity conditions. When the system has to work harder to cool your home, it increases energy use and can lead to higher utility bills. It can also put more strain on the system, leading to more frequent breakdowns and potentially shortening the lifespan of the system.

Recognizing High Indoor Humidity

Recognizing high indoor humidity is the first step in addressing the problem. Signs of excessive moisture in your home can include a musty smell, condensation on windows, damp spots on walls or ceilings, and visible mold growth. Additionally, if you or members of your household are experiencing frequent respiratory symptoms or skin irritations, this could also be a sign of high humidity levels.

For a more accurate assessment, you can use a hygrometer to measure the relative humidity in your home. These devices are affordable and easy to use, making them a valuable tool in maintaining a healthy indoor environment.

Solutions for Reducing Indoor Humidity

Thankfully, there are several steps you can take to reduce indoor humidity and mitigate its harmful effects. One of the most effective methods is to use a dehumidifier. These devices work by drawing in humid air, removing the moisture, and then releasing the drier air back into the room. They can be particularly useful in high-humidity areas like basements or bathrooms.

Proper ventilation is also crucial in maintaining healthy humidity levels. This is particularly true in areas where moisture is generated, like bathrooms and kitchens. Use exhaust fans when cooking or showering to help vent moisture outside. Additionally, ensure your clothes dryer vents to the outside to prevent adding extra humidity to your indoor air.

Regular maintenance of your HVAC system can also help reduce indoor humidity. Make sure to clean or replace your system’s filters regularly and consider having the system professionally serviced to keep it operating efficiently.

While excessive indoor humidity can pose significant health and property risks, understanding the problem and taking appropriate steps to address it can help mitigate these risks. By doing so, you will create a more comfortable and healthier indoor environment.

Health Hazards of Low Indoor Humidity

Just as high humidity can cause many problems, low humidity levels also pose severe health and comfort issues. When the relative humidity in your house dips below 30%, it’s considered too low. Low humidity can make your indoor air feel cooler than the actual temperature, leading to discomfort during cold weather.

The most common health issue associated with low humidity is dryness of the skin, eyes, throat, and nasal passages. It can lead to itchiness, irritation, and increased susceptibility to colds, flu, and other respiratory ailments. Furthermore, dry conditions can exacerbate symptoms in people with dry skin conditions like eczema or psoriasis.

Viruses and bacteria also thrive in low humidity conditions. Studies have shown that influenza viruses survive and transmit more effectively in dry air. Therefore, maintaining an adequate humidity level can help reduce the spread of airborne diseases in your home.

The Negative Effects of Low Humidity on Your House and Devices

Just like your health, your house and devices can also suffer from low humidity levels. Wood furniture, floors, and even the structure of your house can shrink, warp, or crack due to the lack of moisture in the air. Artwork, books, and other valuable items can become brittle, damaged, or deteriorated when the air is too dry.

Electronic devices are also not immune to the effects of low humidity. Static electricity is more prevalent in dry conditions, which can disrupt the functioning of electronic devices and potentially cause irreversible damage.


Balancing the humidity level in your house is vital for both your health and the longevity of your house and belongings. High humidity creates an environment conducive to mold growth, dust mites, and other allergens, while low humidity can lead to dryness, irritation, and the spread of diseases. Each of these extremes can also cause damage to your home and belongings.

Recognizing the signs of high or low indoor humidity is essential in addressing the problem. Invest in a good hygrometer, maintain regular HVAC system checkups, and use devices such as dehumidifiers or humidifiers to manage your indoor air quality.

Remember, proper ventilation is crucial in maintaining healthy indoor air. Use exhaust fans in high-moisture areas and ensure that your clothes dryer vents outside your house.

Ultimately, being aware of the potential health consequences of excessive indoor humidity and taking the necessary steps to mitigate them can significantly contribute to a healthier, more comfortable living environment. After all, your home should be a sanctuary where you feel your best. Equip yourself with the knowledge and tools to maintain balanced humidity levels, and you’ll be well on your way to promoting better indoor air quality and overall wellbeing.