Comfortable temperatures can be extended beyond this range depending on humidity, air circulation, and other factors.
In certain fields, like science and engineering, and within a particular context, room temperature can mean different agreed-upon ranges.
The neutral temperature is the solution of the resulting regression model by setting the thermal sensation vote as zero.
[5] A study conducted in Jaipur, India among healthy young men showed that the neutral thermal comfort temperature was analyzed to be 30.15 °C (86 °F), although a range of 25.9–33.8 °C (79–93 °F) was found.
[13][14] The WHO's 2018 guidelines give a strong recommendation that a minimum of 18 °C (64 °F) is a "safe and well-balanced indoor temperature to protect the health of general populations during cold seasons".
A higher minimum temperature may be necessary for vulnerable groups including children, the elderly, and people with cardiorespiratory disease and other chronic illnesses.
[18][19] Merriam-Webster gives as a medical definition a range of 15 to 25 °C (59 to 77 °F) as being suitable for human occupancy, and at which laboratory experiments are usually performed.