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

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