Check comfort level from temperature and humidity.
Comfort tracks dew point far better than relative humidity, because dew point measures the actual moisture in the air rather than a percentage of a temperature-dependent maximum. Below 13 C air feels comfortable, above 18 C it feels sticky and above 24 C it feels oppressive regardless of the relative reading. The comfort score also penalises distance from your indoor humidity target, which is what a humidifier or dehumidifier is actually controlling.
Dew point and absolute humidity
gamma = ln(RH/100) + 17.625 T / (243.04 + T); dew point = 243.04 x gamma / (17.625 - gamma); absolute humidity = 2165 x vapour pressure / (T + 273.15)
Relative humidity depends on temperature, so 60% feels very different at 15 C and 30 C. Dew point is an absolute measure of moisture and maps directly onto how sticky the air feels.
Between 40% and 50% suits most homes: high enough to avoid dry air complaints and low enough to discourage mould and dust mites.
Around 16 C is where most people start to notice it, 18-21 C feels muggy and above 24 C feels oppressive.