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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Sensor metrics
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Temperature: comfort, sleep, productivity
ASHRAE defines a comfort zone. The bedroom is its own special case: cooler is better.
Dew point: the number that says it's sticky
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.
Apparent temperature: what your body feels
The thermometer reading is just the air. Heat index and wind chill account for humidity and wind: closer to what your body experiences.
The feel of air
Sometimes a room feels wrong even when every number looks normal. Comfort depends on several readings at once, above all temperature and humidity together.
