The most common measurement for our homes is relative humidity, and it’s best to keep it between 25% and 55%. Problems arise when our home’s humidity levels dip below 25%, or rise above 55%.
Ideal indoor humidity levels by outdoor temperature
The most comfortable indoor humidity level will vary from one household to the next, depending on personal preferences. In general, this temperature guide will show you where to keep your indoor relative humidity levels to ensure comfort.
As long as the temperature is over 10C which it is for most of the year, indoor humidity levels shouldn’t exceed 50%. If the temperature drops below this then it shouldn’t exceed 40%.