Ideal comfort

Temperature perceived is determined by the combination of actual temperature and relative humidity
The ratio of air humidity and temperature is proportional: the higher the temperature, the more air is capable of retaining steam. 

De’ Longhi has identified ideal comfort standards: the graph below highlights the standards that achieve such conditions.

difficult to sustain
ideal
sustainable
SeasonTemperatureRelative humidity
Winter 70°F ÷ 77°F 30% ÷ 75%
Spring 75°F ÷ 80°C 25% ÷ 55%