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the range of temperature within which an environment is comfortable for most people with no heating or cooling necessary; also for humans, 28-30 degrees C, at which the naked body can maintain heat balance without sweating or shivering; the range of atmospheric temperature and humidity within which the human body feels and works comfortably and efficiently, typically 19-24°C
The comfort zone is often described as 55° to 70°F with a humidity of 30 to 55 percent.
an environment or situation in which a person feels secure or at ease; also figuratively, an established lifestyle in which a person feels comfortable as long as there is no drastic change
comfort zone com·fort zone (kŭm'fərt)
The temperature range between 28° and 30°C or 82.5° and 86°F at which the naked body maintains heat balance without shivering or sweating; in the clothed body, the range is between 13° and 21°C or 55.5° and 70°F.