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SPECIAL INSTRUCTIONS
How does air humidity affect your health and your home
Excess humidity promotes the growth of undesirable organisms in your indoor environment. Maintaining an inside
humidity range of 30 to 50% indoors helps prevent growth of molds, mildew, and dust mites. Spending time
in a moldy indoor environment can wear down a person’s immune system and resistance to respiratory allergies and
related infections. Indoor air that is free from mold and mildew also smells fresh and inviting.
Excessively dry indoor air can dry out skin and irritate your throat and sinuses, making those areas more likely
to become infected. In arid climates or in the winter when the combustion inside the furnace dries out indoor air, using
a humidifier device increases relative humidity - like the can did - but much more precisely.
Indoor air that is too dry can cause wood to contract and crack, especially thinner wood such as that used to build guitars
and violins. Over longer periods of time, excessively dry air can even crack solid wood beams or logs plus some types
of plaster.
Active heating or ventilation can help achieve a comfortable and healthy living environment.
About dew point temperature
Dew point is a measure of how much water vapor is actually in the air.
The dew point is associated with relative humidity. A high relative humidity indicates that the dew point temperature is
closer to the current air temperature.
For most people, the air feels humid when the dew point is above 15.5°C
(60°F)and uncomfortably hot and sticky when
it goes above 21°C
(70°F) degrees.
Dew Point
Human Perception
Relative Humidity at 32°C
(90°F)
>Higher than
26°C
>Higher than
80°F
Severely high. Even bad
for asthma related illnesses
65% and higher
24-26°C
75-80°F
Extremely uncomfortable, fairly
oppressive
62%
21-24°C
70-74°F
Very humid, quite uncomfortable
52%-60%
18-21°C
65-69°F
Somewhat uncomfortable for most
people at upper edge
44%-52%
16-18°C
60-64°F
OK for most, but all perceive the
humidity at upper edge
37%-46%
13-16°C
55-59°F
Comfortable
38%-41%
10-12°C
50-54°F
Very comfortable
31%-37%
<10°C
<49°F
A bit dry for some
30%
