The differences of AH and enthalpy for room air temperature of 20–23 1C and 23–26 1C are much higher than those at the same room air temperature for different temperature gradients. Thus the small difference of AH and enthalpy for different gradients is insufficient to be differentiated by the subjects. Therefore, thermal gradient had insignificant impact on PAQ, SBS and their PDs. However, dry air sensation, irritations and air freshness significantly decreased with increase of room air temperature due to substantial change of AH and enthalpy for cases with different
room air temperature. Odor intensity and its PD were significantly affected room air temperature. Room air temperature had insignificant impact on PAQ acceptability.
The insignificant effect of room air temperature on PAQ may be due to the relatively small temperature range and the characteristics of tropical occupants. Another possible reason is that adaptation may happen so subjects still accept the air quality after a long period of exposure.