Outdoor to Indoor Temperature Rise and Relative Humidity

The relationship between outdoor and indoor temperature rise - and the effect on the relative humidity

When cold outside air is supplied to and heated inside a building the relative humidity will decrease.

Relationships between outdoor and indoor temperatures are indicated below

Outdoor TemperatureOutdoor Relative Humidity
(%)
Indoor TemperatureIndoor Relative Humidity
(%)
-7 (oC)
20 (oF)
0 21 (oC)
70 (oF)
0
20 3
40 6
60 8
80 11

Related Topics

  • Heating - Heating systems - capacity and design of boilers, pipelines, heat exchangers, expansion systems and more
  • Air Psychrometrics - The study of moist and humid air - air condition - psychrometric charts, Mollier diagrams, air temperature, absolute and relative humidity, moisture content and more

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