Humidity: the 30 to 50 percent rule
Below 30%, your throat dries out and viruses last longer. Above 60%, mold and dust mites thrive.
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Below 30%, your throat dries out and viruses last longer. Above 60%, mold and dust mites thrive.
ASHRAE defines a comfort zone. The bedroom is its own special case: cooler is better.
Pressure rarely changes how the air feels, but it changes how the body feels. It is also the most reliable indoor weather forecast you have.
Light is information your body uses to set its clock. Most indoor environments give it the wrong information.
Relative humidity is relative to temperature. Dew point is absolute. If you want to know whether the air is "muggy," dew point is the number.
The thermometer reading is just the air. Heat index and wind chill account for humidity and wind: closer to what your body experiences.
The same reading means different things in cold-dry, hot-humid, and temperate climates. The interpretation adjusts.
Winter, spring, summer, fall. The dominant indoor-air pressure changes with the calendar.
Indoor humidity outside the 30-50% comfort and mold-safety range. Four diagnostic paths.
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