Room temperature

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Mercury-in-glass thermometer for measurement of room temperature.

Room temperature is a colloquial expression for the typical or preferred indoor (climate-controlled) temperature to which people are generally accustomed. It represents the small range of temperatures at which the air feels neither hot nor cold, often approximated at 21°C (70°F). In more rigorous scientific contexts, it may denote the range between 20 and 23 °C (68 and 73 °F), with an average of 21.5 °C (70.7 °F).

Comfort levels[edit]

According to the West Midlands Public Health Observatory (UK),[1] an adequate level of warmth for older people (aged 58 and above) is 23 °C (73 °F) in the living room, and 24 °C (75 °F) in other occupied rooms. 27 °C (81 °F) is stated as the maximum comfortable room temperature.[2]

Owing to variations in humidity and likely clothing, recommendations for summer and winter may vary; one for summer is 23 °C (73 °F) to 26 °C (79 °F), with that for winter being 24 °C (75 °F) to 27 °C (81 °F).[3] Although by other considerations the maximum should be below 24 °C (75 °F) – for sick building syndrome avoidance, below 22 °C (72 °F).[3]

Scientific use[edit]

For scientific work, room temperature is taken to be about 20 to 26 degrees Celsius with an average of 23°C (about 73.4 degrees Fahrenheit (°F), 293 to 299 kelvins (K), or 528 to 537 degrees Rankine (°R)).[4] For numerical convenience, either 20 °C (68 °F) or 300 K (80 °F) is often used, without being specified as "room temperature".[citation needed] However, room temperature is not a defined scientific term, unlike Standard Temperature and Pressure (STP); admittedly, STP has several slightly different definitions.

Ambient versus room temperature[edit]

Room temperature implies a temperature inside a temperature-controlled building. Ambient temperature simply means "the temperature of the surroundings" and will be the same as room temperature indoors. In many languages, such as Spanish, Portuguese and Italian, there is an expression for ambient temperature, but no distinct translation for room temperature.[5]

See also[edit]

External links[edit]

This article incorporates information from this version of the equivalent article on the Simple English Wikipedia.


  1. ^ Hartley, Anne (1 March 2006). "Fuel Poverty". West Midlands Public Health Observatory. Birmingham, UK: West Midlands Public Health Observatory. Retrieved 25 December 2011. 
  2. ^ Roberts, Michelle (27 October 2006). "Why more people die in the winter". BBC News. Retrieved 25 December 2011. 
  3. ^ a b Burroughs, H. E.; Hansen, Shirley (2011). Managing Indoor Air Quality. Fairmont Press. pp. 149–151. Retrieved 25 December 2015. 
  4. ^ The American Heritage® Dictionary of the English Language (4th ed.). 
  5. ^ "ambiente". Spanish-English Dictionary. Retrieved 20 September 2011.