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According to the Asthma and Allergy Foundation of America:

Allergies are the most frequently reported chronic condition in children, limiting activities for more than 40% of them.

What should my relative humidity be?

The ideal relative humidity for health and comfort is about 35-50%.

Unless you live in an arid climate, periods of high humidity create a myriad of problems for structures and people. Every homeowner should own a hygrometer that measures temperature and relative humidity (RH).

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Relative Humidity & Your Home.

You really can have a comfortable, dry, odor-free home – including the basement – if you control the humidity properly.

“Musty” odors can be a result of dampness, mold, mildew, and other biological growth – a direct result of high relative humidity.

Relative humidity (RH) is the amount of water vapor in the air, expressed as a percentage of the maximum amount of water that the air could hold at a given temperature.

The dew point is the temperature at which the air is saturated with water.

Due to temperature variations, the RH can vary dramatically.

In fact, it is not uncommon to find summertime RH levels ranging from 50% to 100% simultaneously in the same home. Warmer air holds more water than cooler air. For every one degree change in temperature, the RH changes by about 2%.

Living Area Conditions
Temperature: 77°F
60% Relative Humidity
Dew Point 62°

If your home has a basement, it will typically be cooler than the main floor.

For example, if your main floor is 77°, the basement temperature may be only 67°. Even though there is only a 10° temperature difference, there is a 21% difference in RH. Because the basement temperature is closer to the dew point it feels damp.

Basement Conditions
Temperature: 67°F
81% Relative Humidity
Dew Point 62°

Homes built on a slab have a similar problem. Though the room temperature may be 77°, the temperature on the slab is much cooler. As the slab temperature approaches the dew point temperature, RH rises and condensation can form. When this occurs, mold, mildew, and other biological growth soon follow.

Temperature: 62°F
100% Relative Humidity
Dew Point 62°F
Condensation!

To control humidity to the EPA-recommended levels (35-50% ideally) requires a special high capacity dehumidifier. Air conditioners and conventional dehumidifiers can’t consistently achieve dew points low enough to avoid condensation or high RH levels. Ultra-Aire Ventilating Dehumidifiers are unique in their ability to effectively and efficiently remove large quantities of water from your entire home. As a result, the dew point and RH are lowered, leaving your home more comfortable, healthier, and safer.

With an Ultra-Aire Dehumidifier…
Temperature: 62°F
59% RH
Dew Point 46°F
No Condensation!

All Ultra-Aire products are ENERGY STAR® rated, include superior air filtration, and optional high-efficiency ventilation.

For questions or comments, please call 1-800-533-7533 or e-mail us.

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Relative Humidity and Your Home

Symptoms of high humidity may include:

A musty odor in your home, basement, or crawl space

Allergic reactions to mold or dust mites

Visible mold growth in your home, basement, or crawl space

Cupped wood floors

Feeling “sticky” or “muggy”

Visible condensation or water stains

Peeling wallpaper or blistering paint

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The industry’s most complete line of whole house
ventilating dehumidifiers and accessories.

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The Inside Story On Humidity & Fresh Air

Clear The Air
With Teddy Bear

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See more videos on our Youtube Channel.

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Ask This Old House’s Richard Trethewey helps New Orleans homeowners solve high humidity issues in their 1940s-era raised basement home.

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Did You Know?

Ultra-Aire dehumidifiers provide superior indoor air quality through fresh air ventilation and humidity control

Lowering your AC to dehumidify your home can cause condensation resulting in mold.

Ultra-Aire dehumidifiers help reduce the risk of serious health issues through filtration, ventilation, and moisture control.

Overcooling your home to control humidity will make you feel uncomfortable and raise your utility bill, and what do you do in spring and fall.